Malicious PDF — malware analysis report

Static analysis result for SHA-256 4105337237dd5299…

MALICIOUS

PDF

73.0 KB Created: 2021-02-07 08:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 112081da849ed42242d5af4df7c5d874 SHA-1: 2023866cfb06b3cd3bde40b938f7d276d6f9df28 SHA-256: 4105337237dd5299ae2b60ed1b1bc75d6e7a584992c1b75065c36089e5d665d4
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of a URL with 'yowhatsapp free old version' in the query parameter indicates a lure for potentially unwanted software or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=yowhatsapp+free++old+version PDF link annotation
    • https://saripubisopa.weebly.com/uploads/1/3/5/3/135322362/478f19.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/IA4hchj/23419829859.pdfIn PDF document text
    • https://kelulove.weebly.com/uploads/1/3/0/7/130775366/doretafizajademiki.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/pghbgiM/21381095914.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/hahhheY/red_balloon_meaning_halloween.pdfIn PDF document text
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/0859ca43.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/iejfhdg/nuwodal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420244/normal_60081a152e68e.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/jc3ig70/16379109539.pdfIn PDF document text
    • https://pozanabuloga.weebly.com/uploads/1/3/4/3/134366917/e00b7d59aee6f.pdfIn PDF document text
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/rivunijojijevijet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376874/normal_5fe0ad2042a15.pdfIn PDF document text
    • https://pujelewi.weebly.com/uploads/1/3/4/0/134017294/jujelafu-kizan-wagimewezaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_5fda707c7abd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500187/normal_5fdc328610d80.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/pevuwarobuvowa/hotstar_tv_movies_live_cricket_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/65826110536.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_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 5244 bytes
SHA-256: 3c1cfdaaa835b422d7e8dee4dddc00faf6d9085caa9a03d1b30dce4fe7a5c6e8
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10668 bytes
SHA-256: 3a85f5b8bf7b6410e0e18abe7e0115c2c90da40f4795ae3ad68de484fb58c814

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