Malicious PDF — malware analysis report

Static analysis result for SHA-256 e241169ae899b192…

MALICIOUS

PDF

73.1 KB Created: 2021-06-06 16:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76e0b0c99fe7a431e3df1ab57976fc17 SHA-1: 71b59cfe3b570a580e626453dd85ef61b331e562 SHA-256: e241169ae899b192867a4cd5c6d896cd717fb77d00979f6a5e382d1e1d792ab1
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://crysiq.ru/pbw?utm_term=principles+of+human+resource+management+nptel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457006/normal_6035d7af08079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_601b8f4544d51.pdfIn PDF document text
    • https://wunepilupizuxo.weebly.com/uploads/1/3/1/8/131857535/4718135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457847/normal_6050d936c7c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_6025c5571d7eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fc819472f693.pdfIn PDF document text
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/varuloloxodafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5fc9c9762f74f.pdfIn PDF document text
    • https://sevezumu.weebly.com/uploads/1/3/2/7/132710575/2714604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_606e53029ff96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486765/normal_5ff5d9a2d51dd.pdfIn PDF document text
    • https://bakavola.weebly.com/uploads/1/3/4/7/134753875/moseseril-bizerobifefowog-juwugofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_6067226376e60.pdfIn PDF document text
    • https://pegitizikaze.weebly.com/uploads/1/3/4/7/134730703/pisogogu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lerepaxa.pbworks.com/w/file/fetch/144609870/guwojibukemejudonotuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b59471-8b89-43d8-a5cb-b46c474efc86/maxobufow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3106c93-2d57-4e71-b352-d8a3ab1b8c18/used_lexus_es_350_for_sale_near_me.pdfIn PDF document text
    • http://jotuwufo.pbworks.com/w/file/fetch/144708474/manedusukojuxebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87eb9bdd-f5bd-48cb-b664-0186bee2c240/walmart_photo_greeting_card_promo_code.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_off0000e265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 5432 bytes
SHA-256: 4867e2a19a369d99f2515e496d3e14f14843404aca0a04c7b2df290b6cceb3c4
font_01_sfnt_off0000f4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 10096 bytes
SHA-256: ca17893d33b7c4cfdb88a4f21d542ca060d5833a08f2c16d54534ac6b354823f

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