Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c94d28999f3f27…

MALICIOUS

PDF

61.4 KB Created: 2020-11-28 21:55:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dcd25b073e2967a2c94972e23a7e6799 SHA-1: 22b3b82caa5ebdb00dc61a072503a3334831c183 SHA-256: f1c94d28999f3f278f36bf4344cd943904f4dcc271ebdb10877c84c30afcb61b
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 0.9996

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://traffking.ru/123?utm_term=perimeter+of+a+half+circle+equation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420434/normal_5fb370ee12d50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5faab97bf2548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5fb83de1c6820.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/moxitev.pdfIn PDF document text
    • https://fawawivog.weebly.com/uploads/1/3/4/5/134595284/buzuwunedejewosuper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413111/normal_5faed5c1b26b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f9b993184ce6.pdfIn PDF document text
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/5a9d714e4.pdfIn PDF document text
    • https://furedanoduribi.weebly.com/uploads/1/3/4/6/134681858/5606582.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/newobamolomo.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/2cb399449bd8fdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5faeefe215279.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/7acccb7b-800d-4c92-b991-87bb78c48120/35607707494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e64d4208-00b2-493b-83e1-1f7700de0b83/59743808156.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_off0000b2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C5 5072 bytes
SHA-256: b52283b023fc964d93d2110ce795c8281497783be4e2c795283641392f8f3f62
font_01_sfnt_off0000c3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E0 10332 bytes
SHA-256: d8e9b63929a489fcc761328aa13b3a5dfd1d4865903ca16960d4f2dde46c6b97

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