Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a27a179b9cf76ed…

MALICIOUS

PDF

73.3 KB Created: 2021-06-13 14:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f6ace555d4ec0e4d9fad7f5374d1763c SHA-1: 571222ec29395261365a2cf35ee198946e6ecb64 SHA-256: 0a27a179b9cf76ed43d61e9a6d05dfa20fd00da9cbf4ec8535a9cedf32c156c4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://crewmak.ru/pbw?utm_term=functional+requirements+examples+sample PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481988/normal_604029d417a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498883/normal_605b038c2a913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427811/normal_600d871101a09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426687/normal_5fdd1fd631dbd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4427086/normal_60b2efff23e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_601f2c07591aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366313/normal_5ff0e29ebe116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_60269b642ac52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_600d0c5cc793d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5fc9b0732502f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxafonan.pbworks.com/w/file/fetch/144509658/85724684806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4495e9-fdcc-476b-a79f-1e6aea2fb27b/13940366129.pdfIn PDF document text
    • http://sapixesut.pbworks.com/f/pigigewolisewoxigaseza.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144546087/quest_diagnostics_requisition_form.pdfIn PDF document text
    • http://joromonepa.pbworks.com/f/pegezelo.pdfIn PDF document text
    • http://popuwepux.pbworks.com/w/file/fetch/145018251/19392397667.pdfIn PDF document text
    • http://tekitejug.pbworks.com/w/file/fetch/144609675/pusatuwurinoguvufazel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3b8193-a3d8-42dd-ae2e-2a38e3f20a6d/95083779099.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/145183296/anger_of_stick_zombie_5.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/20047339606.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_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 5228 bytes
SHA-256: 24d8536dada976137ebb162db85f7d5388405244abaa765b1fc61ca54eaaab63
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 10496 bytes
SHA-256: b420c70391c6109d5d271f8b463a610a1efaa4572db2ba9408b7f68f071edb67

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