Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21fec87fe552c6c…

MALICIOUS

PDF

94.3 KB Created: 2021-02-26 04:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f6bd9b978fca4a8ca6fde153128e034a SHA-1: aab716a97d3b3a750ee757f8af34774696a001a1 SHA-256: d21fec87fe552c6cf6df39f9a11192ca5272ef33d4030181305b32352ebacde3
156 Risk Score

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 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/123?utm_term=zyxel+pk5001z+modem+reviews PDF link annotation
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/sotamarusavegapiza.pdfIn PDF document text
    • https://lexedixejorew.weebly.com/uploads/1/3/1/4/131438453/pololud.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/45089058405.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/husqvarna_440_factory_carb_settings.pdfIn PDF document text
    • https://xasigusuvenazuj.weebly.com/uploads/1/3/0/7/130739755/4b06c98c8a.pdfIn PDF document text
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/degiwij.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/jHUggjF/fun_literacy_activities_for_kindergarten.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/61374553463.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/amelia_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/31348467557.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/38551128509.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/web_designing_software_list.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/62373633240.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/54034836579.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/what_kind_of_poem_is_the_passionate_shepherd_to_his_love.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/spider_card_game.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/troy_bilt_tb200_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/9856711165.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_off00013436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 5604 bytes
SHA-256: 79dd12a021525cce28c151f236bc3325df55e50cdd90c9404a0bc552b939b827
font_01_sfnt_off00014775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14775 10664 bytes
SHA-256: 5c65238f131c70b220addfcb49781aa87b8e62c0f3edb9cb366a1295ed27f804

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