Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13a5cf465a51c41…

MALICIOUS

PDF

69.9 KB Created: 2021-02-13 03:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: abd26e31c6925e8f9d0481d64a691b12 SHA-1: 1d72734ca365e8a09410f9e727344fb75f56da0d SHA-256: c13a5cf465a51c4128eed490db6990f7849b25238298b8d712ed264d7bbedf7c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL being a lure for 'how to soften cream cheese for dip'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to potentially harmful 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://maypoin.ru/123?utm_term=how+to+soften+cream+cheese+for+dip PDF link annotation
    • https://varijamali.weebly.com/uploads/1/3/1/8/131856150/1377151.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/hgjkPN7/gangs_of_new_york_trailer_german.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/2LwDjgB/shoot_em_up_movie_genre.pdfIn PDF document text
    • http://ryukzak.digital/ropenujuverlx1e2.pdfIn PDF document text
    • http://specialsale.info/chaplin_1992_full_movie_freesve9z.pdfIn PDF document text
    • https://cdn.sqhk.co/pilimisoduk/gkgghhU/fubufuranepup.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/sofezegapimowugit.pdfIn PDF document text
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/2c15d792de542.pdfIn PDF document text
    • https://javosupe.weebly.com/uploads/1/3/4/4/134456121/savopi.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/vcgf0gj/murov.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/ShiibmG/pick_me_up_taxi_oxford.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/2463325.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tagugatukosag.epizy.com/85201388508.pdfIn PDF document text
    • http://movuveso.rf.gd/82367818378.pdfIn PDF document text
    • http://lowoxewepabetex.rf.gd/gefulozokivefisogavugu.pdfIn PDF document text
    • http://wuzuruwevirelu.rf.gd/bojemugumiwofuzul.pdfIn PDF document text
    • http://xexelakufakeze.epizy.com/wutopawak.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_off0000d48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48A 5416 bytes
SHA-256: 693f19e655a9b17118289b00b34bf0572789b231754e23abdf90582fef07165b
font_01_sfnt_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 10724 bytes
SHA-256: b8a596afd1b08b909b6e48e10072e15c4ada7947912c67c9a1455d62d885800e

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