Malicious PDF — malware analysis report

Static analysis result for SHA-256 3303b7e8ffa87775…

MALICIOUS

PDF

79.4 KB Created: 2021-02-17 10:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 74febc89700cc3c52a937c06caf3ad78 SHA-1: 0093056cf7fd0443948ced49985315ee1936b918 SHA-256: 3303b7e8ffa87775802d5f16a1d1129283cecf15b557ba74eec67aa7f07776c6
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded URLs and the document's structure point towards a phishing attempt or a downloader for further malicious payloads.

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/wix?keyword=50+shades+of+grey+contract+rules PDF link annotation
    • https://tajafakedebufu.weebly.com/uploads/1/3/1/4/131438499/815a383.pdfIn PDF document text
    • https://selemuja.weebly.com/uploads/1/3/4/8/134893326/3708509.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466676/normal_5fc90119d335e.pdfIn PDF document text
    • https://safuziketuxoxu.weebly.com/uploads/1/3/0/8/130814855/mirogetalalujosisaj.pdfIn PDF document text
    • https://furuvisagibeveb.weebly.com/uploads/1/3/1/4/131453033/webusasiso.pdfIn PDF document text
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/7864681.pdfIn PDF document text
    • https://ripegedabezigiz.weebly.com/uploads/1/3/2/6/132695689/4536542.pdfIn PDF document text
    • https://nebenumepidenok.weebly.com/uploads/1/3/5/3/135307723/dunat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_5fd13a6b70a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_5fe8f8a5af11b.pdfIn PDF document text
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/59274b27906c3bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5fdc2c7f34b7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/16276706212.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/63822241439.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/63199437055.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 5388 bytes
SHA-256: ed0213254f8c5c54fbc6146269bbd1b06ae4e8f6422b2229ab674fe03ad39a36
font_01_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 10492 bytes
SHA-256: 48ad76bd48e60d25a202f64d9f8c17b7f2b499904c36004874135139e3419167
font_02_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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