Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3db39c20f066bfc…

MALICIOUS

PDF

72.7 KB Created: 2021-03-29 05:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 441da008280d85b42f14e54122c5a2ed SHA-1: 51661f480b3c0bb9a8eecf49fe17dffa7311087a SHA-256: c3db39c20f066bfc3c7b3a700a61001d48ded258cc760e215090ee2520028c19
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 0.9992

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://botokaw.ru/wix?keyword=elsa+hairstyle+toy PDF link annotation
    • https://cdn.sqhk.co/xugiwatokax/gyijfia/jazoxigodukevosa.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/xOjjmLF/slimeatory_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/rezalabobo/gdifaHU/myth_defense_lf_full_version_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/7hfjpjb/tetris_ultimate_pc.pdfIn PDF document text
    • http://waxosasovan.22web.org/merefaniv.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/fQhgjjC/monubilevi.pdfIn PDF document text
    • https://cdn.sqhk.co/muwitajo/ibIQ3ha/50920984993.pdfIn PDF document text
    • https://cdn.sqhk.co/nutanujel/Vhbzygf/shooting_world_gun_fire_apk.pdfIn PDF document text
    • http://dutusejutax.22web.org/17290104044.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wowadepadon.rf.gd/collformic_matagalls_amb_nens.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/33286267365.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/cub_scout_book_webelos.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_24b3c943ed6a4042b89b54c3e842ed4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7352e78f-d991-454d-88c0-cd5dccee4f8c/how_to_solve_decimal_division_easily.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/xelapopazavoki.pdfIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_9f8e238589574d9f8e032beb2f8b2233.pdf?index=trueIn PDF document text
    • http://gamexelonin.rf.gd/faledajuzinodole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feae0c10-ff87-42d1-8873-da3dcbe2f138/calvin_and_hobbes_snow_cartoons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3614e5-7316-440a-b76d-d81f12c6380a/sujetorifetanidim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/923675da-8510-439e-956f-613675b7527d/82366142885.pdfIn PDF document text
    • http://rudolonofuxa.epizy.com/ipa_alphabet_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/tarorakovufagutiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2acc7bc-b10d-470a-8555-b2708326569d/xivoresesavuwuwula.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 4832 bytes
SHA-256: 3420ca5f04e1617972ff12482cece3d346e42b64a58cdd8a76cb7e5975663816
font_01_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 11824 bytes
SHA-256: 1cc90da5641b1cff632a5f88a737d12a011fec71ec33a21d3bbf41ffa9e754d3

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