Malicious PDF — malware analysis report

Static analysis result for SHA-256 afea98cba84dc74b…

MALICIOUS

PDF

78.5 KB Created: 2021-02-15 19:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 116360859a553222b655d26be0847401 SHA-1: bad07bc1df12153ed384bb52ab5a2a5639bce356 SHA-256: afea98cba84dc74b7809cc4a00376552797ab91e7158c936be2c24b231126c1f
186 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The presence of embedded URLs and the PDF structure suggest it's intended to redirect users to potentially malicious content or phishing sites.

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://seumenha.ru/wb?keyword=mercury%209.9%204%20stroke%20oil%20filter%20location PDF link annotation
    • https://lutoropekitixes.weebly.com/uploads/1/3/1/3/131384777/lebonata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_601b80bcdabb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_60235384a8442.pdfIn PDF document text
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/gutokavusumusov.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/4004185.pdfIn PDF document text
    • https://gikuxowatevu.weebly.com/uploads/1/3/2/6/132681634/viwipu.pdfIn PDF document text
    • http://getsol.xyz/xadapofabekovunotolimofmd6ga.pdfIn PDF document text
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/4b76f457c1ab5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5fede343b2a9f.pdfIn PDF document text
    • http://mazanatur.space/chhattisgarhi_cg_song_free0n2p4.pdfIn PDF document text
    • https://duvafoxugijotad.weebly.com/uploads/1/3/5/3/135305538/4395843.pdfIn PDF document text
    • http://white-x.fun/dutivifizonubolavesasujhb5i4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/cisco_catalyst_9200_ordering_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/1538169091.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_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 5320 bytes
SHA-256: 79c9b3b5c93dade8ed403d3b91da820cbf3b275ed7cf6d9976e7f9f70f06bf4e
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 10612 bytes
SHA-256: 63aab5d2bdcf7aa636f769150c6a0b86d53a157412d18e0888a60fc5be6b2a2c

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