Malicious PDF — malware analysis report

Static analysis result for SHA-256 371e603f5091879e…

MALICIOUS

PDF

76.2 KB Created: 2021-05-07 20:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4f2f2bcf0ae091f86d673b320813184e SHA-1: 21bcb69e136b49bfd8831e15d49172c76f1b5fd8 SHA-256: 371e603f5091879ec6c43252f6d23049a45bcf29e2955c5ba754a3fd5108cc2f
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous external URIs, with one notable example being 'https://golowaki.ru/strik?utm_term=how+much+should+i+charge+to+create+a+logo', suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, further supporting a malicious intent to redirect users. Although no scripts were explicitly extracted, the presence of embedded URIs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/strik?utm_term=how+much+should+i+charge+to+create+a+logo PDF link annotation
    • http://wuderiwewilew.22web.org/nosufamiridapol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_600ba5f0b325a.pdfIn PDF document text
    • http://tijidewun.iblogger.org/brunswick_a2_pinsetter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485943/normal_6004c00603c00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379236/normal_5ffa091ae3125.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368503/normal_5ffe0f664c616.pdfIn PDF document text
    • http://wowuwifun.iblogger.org/lapumivoxidezu.pdfIn PDF document text
    • http://noxesim.iblogger.org/amino_acids_file.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/g5BhgpG/free_hilarious_ringtones.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/ibgjiaJ/casino_card_games_list.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/iaEfLjc/tikabidafux.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/hfjdKkS/98159313772.pdfIn PDF document text
    • http://uscreditscore.info/jelagujusututisofuvorrcxsp.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/ji6hd77/ace_combat_6_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_6041aadf6c536.pdfIn PDF document text
    • http://befemoxujutebi.22web.org/17187071450.pdfIn PDF document text
    • http://mexicotop3.xyz/wasepekafometibil2gzco.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://selofedibaxonal.epizy.com/a_r_rahman_bgm.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/69373225262.pdfIn PDF document text
    • http://zavukazena.epizy.com/danot.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/wesukurimanuwoxodo.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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 5408 bytes
SHA-256: 45c23bfb09f99e935606403503147397c8f92809c7464bf59e42df52e781555a
font_01_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 10584 bytes
SHA-256: 2f37ae2a344547c2860b6c24e99df846969b8982dc5180d17bd715e44aca77fd

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