Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f1bedc38e32df9…

MALICIOUS

PDF

78.4 KB Created: 2021-05-08 09:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 19eb0937f20ee1692326bd66b6bde303 SHA-1: a9fc38aa8abd1aefaf06d43d1b5fe0f0459f1dfe SHA-256: 41f1bedc38e32df97a5fafda0944e80cc7ce5478ba82ec4355c4e49a37c5e9ef
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 0.9997

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://seumenha.ru/strik?utm_term=qsc+touchmix+16+specs PDF link annotation
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/ginefufa_radaxevusejijo.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/antenna_and_wave_propagation_book_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490746/normal_6029fcddf3376.pdfIn PDF document text
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/6953302.pdfIn PDF document text
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/2200727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421215/normal_6046f435de574.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/bodamupububadi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463526/normal_5fcec0c552876.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463277/normal_5ff933a5ced9e.pdfIn PDF document text
    • https://zajawegunane.weebly.com/uploads/1/3/4/3/134332092/bepusis-nanupewitabemo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471512/normal_600344186525e.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/dumupa/how_to_set_timer_on_cuisinart_slow_cooker.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/94726267993.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/kidney_histology_guide.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_004bae1221da4ce6a17cb0b688a37e2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/how_do_i_connect_my_wavlink_ac1200_wifi_extender.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_ec79be76d71040f1a00181aa0c19f00f.pdf?index=trueIn PDF document text
    • https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_34cecca8fa104b00a6fedc2588846395.pdf?index=trueIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_80c0e373a97642d7abeeec7630e10e96.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_2dea1cd60fbc4c279879219d65f36bf9.pdf?index=trueIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/47645261621.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_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 5172 bytes
SHA-256: c3f75fda192a2c0cd317b7d0cb82029b97b49e1b56246450a4986c230bc20918
font_01_sfnt_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 11956 bytes
SHA-256: d0106706fad87b9168b12c4a823a78ada3aa829984e19f32d41f49ab68128409