Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0b31fbe44c218f…

MALICIOUS

PDF

72.6 KB Created: 2021-01-01 01:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c4ed90a5c1de1e880e79791348977c95 SHA-1: 0fe103bf4b7a0e3792605b6f5fd3fbfa2b482110 SHA-256: af0b31fbe44c218f1a3c247c4b726c901849762e773048cf756a81de48bd7fe7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a mass external link farm, with one prominent URL being https://fuxomiluzixoxam.weebly.com/uploads/1/3/4/5/134594746/mofujosukugumu.pdf. Another embedded URL, https://trafficel.ru/123?utm_term=yellow+and+black+flag+meaning, is also present. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, but the presence of numerous external links points towards a phishing or content distribution scheme.

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 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.
  • 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://trafficel.ru/123?utm_term=yellow+and+black+flag+meaning PDF link annotation
    • https://fuxomiluzixoxam.weebly.com/uploads/1/3/4/5/134594746/mofujosukugumu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5fc49c560ed32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_5fa19051793c3.pdfIn PDF document text
    • https://gagijilit.weebly.com/uploads/1/3/4/8/134865103/073dcc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5fbbf0dbd765d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_5f8aa5fa4979f.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/84edd8c6-c94f-42dd-8cea-52a363fd16fd/gta_liberty_city_apk_download_revdl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ed8610-2c80-4505-bb94-c1d0a950d68c/44876571335.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/10137264362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032a39bd-054c-495b-919d-df665bb0f8c6/217793688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a81608e-0ded-4240-9d90-4aaa9bfa0984/any_calls_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09f524e-eb02-49d8-b35f-965977a36a5d/96282951317.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 5324 bytes
SHA-256: ad8127d044b487024e5ec5e8de17d2d908ecf669b686fce5d8e4f01a1723e7b2
font_01_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 10224 bytes
SHA-256: 8c99f7ec14e5ff5d2284df08d0bb03bdf6f1b1dbac2308111b07938d47269134

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