Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd3cd7c98f7410f…

MALICIOUS

PDF

96.2 KB Created: 2021-03-28 23:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3c3d4a8642ec27026bd385fbd8641b1c SHA-1: 4afa91fd1d0d56196cc8cd5fb322e4296fc581e4 SHA-256: 7dd3cd7c98f7410f5e8837f8085f1f8274160adfd144ee3e5bf706f186cc1b43
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/123?utm_term=amla+tree+information+wikipedia PDF link annotation
    • https://cdn.sqhk.co/tovipovo/HUA9jeI/bad_piggies_hd_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486034/normal_605223a18aaa4.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/mskhcEh/27114708349.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/hifgdja/translate_english_alphabet_to_japanese_kanji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476767/normal_60326d7fbd90a.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/dOgfjfz/21354208606.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476140/normal_5fff2f7ce444b.pdfIn PDF document text
    • https://cdn.sqhk.co/jesuzedavoti/gdX7ihg/ap_biology_unit_test_cellular_energetics_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_46361f5e0a6f41619f78439c619c631c.pdf?index=trueIn PDF document text
    • http://pavasokunise.epizy.com/neural_network_projects_with_python.pdfIn PDF document text
    • http://lujonasab.epizy.com/luxuxuvupolebabobir.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_734dab1e6db347a49b6a693da319212b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/star_citizen_capital_ships_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/93652661135.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_ec6c8ff926ce4a91a71169c371db081a.pdf?index=trueIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_480d9e202290464a8520469ed3fb64b0.pdf?index=trueIn PDF document text
    • http://kobuxotaregudes.rf.gd/carolus_rex_album.pdfIn PDF document text
    • http://virilos.epizy.com/dekokisavopodesexe.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/dosadowufekidirifini.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 5152 bytes
SHA-256: 31df7f8081b094ffb1c08448d45a8fb37b03a81239752e38d4a3b6956f0f3b45
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 3548 bytes
SHA-256: ae4f113b49d464e19dcbc1edfdf8eb1a699e164e09b2803db88bc4fbf1fc2ab6
font_02_sfnt_off00010eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 4528 bytes
SHA-256: 6f477b9f6cb725eb098e124758c7914db6bbcf5e2fd8ab0f5bb4c6bdf12eb4f3
font_03_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 2112 bytes
SHA-256: 1dd76ad3e9711199b598b155577506e25c11c90e447afd931a32a1420c4b6170
font_04_sfnt_off00012781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12781 12304 bytes
SHA-256: 78cd68fa4f325099d520335c84a9610ccd996025db430fbc6a29ee74f003d6f0
font_05_sfnt_off00014f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2A 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_06_sfnt_off00016494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16494 2864 bytes
SHA-256: 93c9f54a64d231ac1ddb3e77d150b4da6d3e103914c3245581309d1093e3843a

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