Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19961092ba293a3…

MALICIOUS

PDF

69.2 KB Created: 2021-05-29 06:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 895ea4c49a5978cf01854e7c209275c2 SHA-1: e73cb78df55b9a08a78b1605aa8b6d0eb06e95b0 SHA-256: b19961092ba293a3f8f7eab6802d58bda9b38ee704cecf8ce9194912d398af99
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://xajibur.ru/strik?utm_term=reflexive+pronouns+exercises+pdf+4+eso PDF link annotation
    • https://zuxogujuwikowe.weebly.com/uploads/1/3/0/9/130969390/dadixigofepuda.pdfIn PDF document text
    • https://jizojalagakamu.weebly.com/uploads/1/3/4/8/134886497/kanolexa-kunel-sakexepu-kapisiliweka.pdfIn PDF document text
    • https://bavazaje.weebly.com/uploads/1/3/4/3/134335981/efbbaf8a7a1d246.pdfIn PDF document text
    • https://feranipadolop.weebly.com/uploads/1/3/2/7/132740228/gopuretenovoroxuv.pdfIn PDF document text
    • https://wilexezixokesu.weebly.com/uploads/1/3/4/7/134764798/7f80d60cabafb2e.pdfIn PDF document text
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/mikukabogemovekovo.pdfIn PDF document text
    • https://koximewi.weebly.com/uploads/1/3/0/7/130775363/43d0f6036267.pdfIn PDF document text
    • https://jopepikenaz.weebly.com/uploads/1/3/4/6/134652119/634b7d3b96.pdfIn PDF document text
    • https://vuxukavimegi.weebly.com/uploads/1/3/5/3/135328550/6419525.pdfIn PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/a77f9842b2.pdfIn PDF document text
    • https://sudewivevumofe.weebly.com/uploads/1/3/4/0/134042571/lelovuvuvale-weripoputined-jegigiguwejofa.pdfIn PDF document text
    • https://nadunetuvopalo.weebly.com/uploads/1/3/4/8/134884029/mirij_talebole_zuwolojiz.pdfIn PDF document text
    • https://vigegenatiborig.weebly.com/uploads/1/3/0/7/130740049/124091.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/pawivil.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/48f5152c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ce6b82-f139-4097-81d3-f37d380cc5dd/c_data_structures_and_algorithms_marcin_jamro_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1a79fe-8d67-4278-9fac-9789f1c7d5e3/33124958508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b60625f9-428a-4019-9a3e-93e27c61dbf6/traktor_s4_mk3_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8696b6d-af73-4c49-bdde-793e36562adf/pergamino_numero_1_el_vendedor_mas_grande_del_mundo.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_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 5164 bytes
SHA-256: 43ea56336fd1f1147033e868ab7e804ed0bb61263016f701541233e5186a0605
font_01_sfnt_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 10704 bytes
SHA-256: 55fe11cf19af635f40a22b25ca2cd699f5b6f2e0cf42f63a8c9aed673a6b781f

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