Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbc773c1518247f…

MALICIOUS

PDF

84.5 KB Created: 2021-04-01 04:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5fb4f961d337bd46921395c048aa1911 SHA-1: 4b6905b99a61e88857d87330e90db8ef4ac7e40e SHA-256: 3dbc773c1518247ffb898c9cb5bbd4bc434ac8a715cc72513342755b5811c177
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to other PDF files hosted on disposable domains, which is characteristic of SEO link farming or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/wix?keyword=new+conservatism+ap+euro PDF link annotation
    • https://cdn.sqhk.co/ranemagesoga/gihggi0/teker.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/bTignhh/perfect_turn_a_gundam.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/HggijWA/electricity_bill_check.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/Vl3hcnR/kosevatuviwozamegij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8decf640-e97a-4a30-a865-577b88d52080/29618699421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/386bdc8a-cd98-4fe9-9e50-6fd38514d6c9/what_is_the_word_count_of_the_harry_potter_books.pdfIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_973d8fbd796444f8b9aec623061e9216.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5acb14-07ff-4fb7-9a13-d4c4b6857933/murugakisuror.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/47163301174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f867125-248f-4f7d-ba17-fa8b30f05cb3/67858699128.pdfIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_9c34df93e5c8434fb3a72e9931d9ff21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22cad7d5-6d69-4d16-819b-254cad7d014e/how_do_you_run_a_3_phase_motor_on_single_phase.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_c6b2aedfd7984ac28849806c1db576a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resisuna/5503066402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb27aeba-038b-4c8a-85ba-69d3dcfff946/gusulukigelud.pdfIn PDF document text
    • http://wedalavunobuwe.rf.gd/american_college_of_cardiology_guidelines.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_f4dce77257134ac58651b14e3b95c03c.pdf?index=trueIn PDF document text
    • http://kekunulu.epizy.com/aruba_iap_225_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23178a5f-99e4-43da-a355-411a25846de1/all_the_birds_in_the_sky_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db36a743-e1e6-4c1e-80f9-938529c9ae4a/ultimate_diet_2.0_reddit.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_7f0a6a46b7bd4d08844a0c1391a73885.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/are_wen_inverter_generators_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71de7b93-2ce9-499e-ae6d-fb02a2bcd3e1/62619236217.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 5048 bytes
SHA-256: 02d906eda6c67354db8036ad6dc788cfcfbc71b55e349d2330a32b85fe75dcbb
font_01_sfnt_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 4740 bytes
SHA-256: 81c3e7e59153c2203bd7e7e6238992d568ea5f2fcaf15d0ac75e2c846da558ba
font_02_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 10408 bytes
SHA-256: 52b46f343f1ae9e253e39287a0d522e6d903919bed159c945d91531d58877945
font_03_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17
font_04_sfnt_off000133a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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