Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d66f050b443cb09…

MALICIOUS

PDF

73.1 KB Created: 2021-03-02 09:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f5675eb138b122d40d1e2ae86bb184b SHA-1: da8340772187adaf590ed4af1fdffa7459a84446 SHA-256: 0d66f050b443cb0926f0237db4c2678af68c0c6962389f77c66936841acb789f
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, with a primary URL pointing to 'https://dafemum.ru/123?utm_term=power+of+words+book+bts+v'. The presence of a link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://dafemum.ru/123?utm_term=power+of+words+book+bts+v
    • https://static.s123-cdn-static.com/uploads/4452861/normal_5fdd3aa3c6ea3.pdf
    • https://static.s123-cdn-static.com/uploads/4413125/normal_5fe1f643ceeca.pdf
    • https://cdn-cms.f-static.net/uploads/4447267/normal_5fdc875a78c87.pdf
    • https://zejewovelopitut.weebly.com/uploads/1/3/0/8/130813539/xolokabukiko-jugobegoxosepib-tiwosat.pdf
    • http://nepatokada.mypressonline.com/tomorrow_when_the_war_began_cast_tv.pdf
    • https://dulodegusatoto.weebly.com/uploads/1/3/1/6/131636763/mexoruwepokagez-wofeforowusexe-gidubasofaw-foxenujib.pdf
    • https://netevidogewe.weebly.com/uploads/1/3/4/7/134715311/b3f1523ce71.pdf
    • https://tifevijokob.weebly.com/uploads/1/3/5/3/135351552/2117199.pdf
    • http://mon-compte-cmb.best/dexenetalegifidurasavifk5ndb.pdf
    • http://idealslimitalia-official.site/television_and_american_culture_jason_mittell_download4rbrq.pdf
    • https://lopatitegadusi.weebly.com/uploads/1/3/5/3/135311006/5374914.pdf
    • http://kindraretterath.com/54644838758tam69.pdf
    • http://gejejasofubi.mywebcommunity.org/the_tale_of_peter_rabbit_characters.pdf
    • https://sakobapo.weebly.com/uploads/1/3/3/9/133999770/mojimuzipo_lefusasolevoba_bixikireru.pdf
    • http://legalvictory.group/befotegojirujubil91g0.pdf
    • https://cdn-cms.f-static.net/uploads/4420760/normal_6014b21d79ecb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rizivubonulej.atwebpages.com/jikefurabawemumox.pdf
    • http://rabelinowizufe.myartsonline.com/lexaxanuziw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e041.bin
8366e40c0a8b79f8da0ce29d380df0519785ccecd4634acd14bfded1f4eeb9a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 5016 bytes
font_01_sfnt_off0000f182.bin
8a9b8938fdd9cc816b51a985539a6cc2c90538cf64911fcc98d7c34f3a9db29d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 11224 bytes

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