Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb971906956a5d9…

MALICIOUS

PDF

75.9 KB Created: 2021-03-07 23:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0540196e4255ee7f7ad48a2717dabb5a SHA-1: 7b4881a9122c01c62dc98b21dab29162901381db SHA-256: ceb971906956a5d97588ae39d4a55b48e5de63ef84ab0f58c8de7ae549da1292
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

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/strik?utm_term=sauder+5+shelf+bookcase+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486060/normal_5ffd0afc21c44.pdfIn PDF document text
    • https://tajusubinem.weebly.com/uploads/1/3/4/8/134886452/fa3524155.pdfIn PDF document text
    • http://dabuxupufudina.22web.org/20400239091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475376/normal_6005c9fa8cc4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_5fe8d6173f13f.pdfIn PDF document text
    • https://sazezikamujut.weebly.com/uploads/1/3/1/4/131438312/likesafa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_5ff979cb9baed.pdfIn PDF document text
    • https://luvatuxi.weebly.com/uploads/1/3/4/3/134321506/6800117.pdfIn PDF document text
    • http://fazoluniguket.iblogger.org/loweraxoxodalepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485696/normal_6023da28c0fe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481830/normal_603e54811361f.pdfIn PDF document text
    • https://xopapukewude.weebly.com/uploads/1/3/1/4/131408664/53adb994a.pdfIn PDF document text
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/5d132df79fac816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530070/normal_60431daddef31.pdfIn PDF document text
    • https://gatikewud.weebly.com/uploads/1/3/4/3/134382011/15639.pdfIn PDF document text
    • https://rebodegumirimak.weebly.com/uploads/1/3/0/7/130775130/kobiwokimage.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duribolatajofa.atwebpages.com/suxase.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/nemixavotajuxopoxovalorar.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_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 5540 bytes
SHA-256: b6d03e6ce9aa5f5ce5a3526f98ebde989f332757299f0988fd8846d4e414ead8
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 12420 bytes
SHA-256: 3e580f5deb0cfbaf12ce8973de91de76df8d9f597a10840d33f2bc361ab02a59

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