Malicious PDF — malware analysis report

Static analysis result for SHA-256 874aa2fbdf68d584…

MALICIOUS

PDF

69.7 KB Created: 2020-12-25 00:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7f438d914d56782fe613713dfc0f8e5c SHA-1: 52c8e8c25b8848f31791857034a089cf2ce37c7c SHA-256: 874aa2fbdf68d58421f7f11e98668739b7dbbd1d7d534195e467520ffb424281
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, with several heuristics indicating it functions as a link farm. The presence of 'utm_term' in one of the URLs suggests a tracking or marketing purpose, but the overall structure and the ClamAV detection as 'Pdf.Phishing.Trojan' point towards malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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://traffset.ru/aws?utm_term=synonym+social+media+platform PDF link annotation
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/bc872293.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/vatuwof.pdfIn PDF document text
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/e1ef8b5bd7e3.pdfIn PDF document text
    • https://vugifalufaduzo.weebly.com/uploads/1/3/4/8/134889855/mosavabipatisukeno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5fdf16e3ae81d.pdfIn PDF document text
    • https://ratisajaruniz.weebly.com/uploads/1/3/1/4/131455275/b92a3ae00.pdfIn PDF document text
    • https://numomepezudoti.weebly.com/uploads/1/3/4/3/134320197/jorosigaxazijuv.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/5fae7745-f75d-4733-bc73-3e2a38fe3637/unnatural_vegan_blm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/567a3d94-bc39-4c35-ac28-598ba3dd8541/nba_2k18_apk_android_7.0.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/lazotux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d906615-10f5-49aa-9f16-3716b1bc782f/99812481238.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/86285004557.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/abbyy_finereader_6._0_sprint_freeware.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_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 5508 bytes
SHA-256: 8b1320cc0a0ddf9827db59df9acbb61bc5fee91a981b965ffda1d70152056841
font_01_sfnt_off0000e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 10408 bytes
SHA-256: 2cee7c425d89039ba9144082ac8487921c5c04305b43302e065ad612b10a80ff

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