Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d552400e6b534f9…

MALICIOUS

PDF

83.6 KB Created: 2021-04-22 15:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cef4565235bf53d6c23c66b6791e39a5 SHA-1: db1ca530262475212417987186c5a22360046c5c SHA-256: 8d552400e6b534f9d23d827477c9cbcc3cce4cee063f4df9f24aeda97bcf7683
186 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 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://jacksth.ru/strik?utm_term=my+favorite+things+lyrics+meaning PDF link annotation
    • https://kisetizep.weebly.com/uploads/1/3/5/9/135992433/4048130.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/VJFWhgT/dodezepunarege.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/d4jfhfD/batasila.pdfIn PDF document text
    • https://xusezazidajitov.weebly.com/uploads/1/3/5/3/135325201/2798594.pdfIn PDF document text
    • https://bikuxemigoveju.weebly.com/uploads/1/3/4/3/134373773/3063163.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/1674298.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/D6hgIgd/lojewaso.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/owpFhaU/pixel_art_editor_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/eijhcBK/red_ball_4_game_mod_apk.pdfIn PDF document text
    • https://jebelobuf.weebly.com/uploads/1/3/1/4/131452997/berizewowigikak_dilupera_kowipuwojuxu.pdfIn PDF document text
    • https://davufafelasipip.weebly.com/uploads/1/3/4/3/134328138/wufoxikapekotes.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/gibejujosenode.pdfIn PDF document text
    • https://cdn.sqhk.co/nudotunaza/qjih5ia/color_tunnel_2.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://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_74465604509644698fb0a751f51e6fbe.pdf?index=trueIn PDF document text
    • http://xejimeve.rf.gd/chemistry_dictionary_english_to_bangla.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_9df204ffe1d1417bad8146bad5439166.pdf?index=trueIn PDF document text
    • http://suwuxuk.epizy.com/94063459589.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_5bb99550bec54b9f8bd7640ca46fb161.pdf?index=trueIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_4a08dc8b30d5463887ddeeb26f6b1085.pdf?index=trueIn 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_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 5248 bytes
SHA-256: 8e2d1bcac3eecf328d3e73920954556469ab322d8b5e2b75faf10bbe5e7b09f8
font_01_sfnt_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 11892 bytes
SHA-256: 51da1dd5f84a812031e1a53420b7b527344610e0247837c49ec02fe891c81c39
font_02_sfnt_off000132f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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