Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bcca6a51988171…

MALICIOUS

PDF

75.5 KB Created: 2021-02-22 16:31:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: deba386394b023939c8158b3aa38fbe0 SHA-1: 23b4bbae41b4d6aa3db4394f301d9cb04dcf6889 SHA-256: 05bcca6a51988171d94fd6cb68c37de4f0d9b7dfd3f6cd0bb89108e6e5d3cbb2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or SEO spam tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially malicious or spammy websites.

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://druttle.ru/wix?keyword=white+city+auto+parts PDF link annotation
    • https://cdn.sqhk.co/ramejolir/sD1aiaP/8119755077.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/a23fUig/3d_bowling_apk_mod.pdfIn PDF document text
    • https://nakaporona.weebly.com/uploads/1/3/1/4/131438848/336715.pdfIn PDF document text
    • http://simultaneously.space/xatekugejavavufuje1k1ug.pdfIn PDF document text
    • https://kagiwegelugamed.weebly.com/uploads/1/3/1/4/131453087/xizemomojuwaxenor.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/gjdghji/company_of_heroes_board_game_review.pdfIn PDF document text
    • https://golinogejus.weebly.com/uploads/1/3/1/6/131606227/xenepesifetiz.pdfIn PDF document text
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/pufinowati-foxijimifo-wilotoko.pdfIn PDF document text
    • http://chebsvet.ru/rakshasudu_chiru_songs_freepvofk.pdfIn PDF document text
    • https://gigijegijozi.weebly.com/uploads/1/3/4/4/134400985/570d46.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/jVjj2ig/47256845284.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://s3.amazonaws.com/wovigebi/56813252544.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/macos_10._15_catalina_iso_image.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/botw_divine_beast_vah_rudania_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/cartoon_jump_sound_effect_free.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/wunurox.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/novel_drug_delivery_system_books.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/gutazubulubifakoj.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/39266954676.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 4880 bytes
SHA-256: 2181d1e00a3485abb3a312259613d83a286aa1f8c56fb79136481925d74fad2b
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 10624 bytes
SHA-256: cc11b7ca32bb8e228c0f07977144889f491a1f18a7297333652a7b8e54f837f5
font_02_sfnt_off000112a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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