Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e913dcefdfd8bb4…

MALICIOUS

PDF

69.8 KB Created: 2021-05-13 03:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7bf6cbc8fc3089d0bfa4c0ac811cdcf5 SHA-1: 9422e5c50185557331cf131c0853a83bf8c78c4a SHA-256: 1e913dcefdfd8bb4aa1cc26cf4e59525282ec5ff6104e37ca164ef5e47b8306d
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-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.
  • 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://leonvi.ru/strik?utm_term=sundance+spa+filter+chart PDF link annotation
    • https://cdn.sqhk.co/lowimipofevu/8qjDojb/best_friends_forever_game_download_pc.pdfIn PDF document text
    • http://gumidaz.medianewsonline.com/local_variable_in_java.pdfIn PDF document text
    • https://vuzirokisex.weebly.com/uploads/1/3/4/5/134576988/5891930.pdfIn PDF document text
    • https://kelukija.weebly.com/uploads/1/3/4/3/134337818/fuzimuxagazu.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/xatepupuj.pdfIn PDF document text
    • https://vunuvuvoxi.weebly.com/uploads/1/3/4/8/134889930/wowelubepiguza.pdfIn PDF document text
    • https://cdn.sqhk.co/setanutoba/ghrhdcH/behaviorism_in_teaching.pdfIn PDF document text
    • https://mubuwevuli.weebly.com/uploads/1/3/4/5/134528176/9524083.pdfIn PDF document text
    • https://bokakarepexopo.weebly.com/uploads/1/3/4/7/134750167/datuxuzofi.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/woberiz/chennai_express_video_songs_320kbps.pdfIn PDF document text
    • http://vipojidetag.epizy.com/list_of_architects_in_hyderabad.pdfIn PDF document text
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_445c5e4837a34969afa7be20beaa0783.pdf?index=trueIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_d8517f6cda3a4a1b894254638cb1197a.pdf?index=trueIn PDF document text
    • http://divimoxigorube.epizy.com/18000990837.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_299115570b1448b3a39c1e2467e8a0d0.pdf?index=trueIn PDF document text
    • http://mawuwumeludil.epizy.com/lukogakaderelet.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/synergy_editor_mac.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_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 5344 bytes
SHA-256: a667c4618d4a054a4d771f2e04d2701a395cb46c7f6dadb2555bbbe05595c10a
font_01_sfnt_off0000e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 10420 bytes
SHA-256: fbc271500fca2a6c0f83cfcbfcbd99afac9237c1a83310f08c4b4012b1bdfb34

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