Malicious PDF — malware analysis report

Static analysis result for SHA-256 3354020cfe61ba8a…

MALICIOUS

PDF

121.0 KB Created: 2021-03-31 07:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 351e64c2edcb409f2b442fe32ce0f44c SHA-1: e8578c1fb22d18e312241eb334bb761817e9e5f4 SHA-256: 3354020cfe61ba8a3678dcc3ed6121ae62ce0ba6a07627987c8cd9f64c65e6b8
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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-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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=s10+v8+conversion
    • https://cdn.sqhk.co/galemojubemo/ehahghj/95710834772.pdf
    • https://xegezegev.weebly.com/uploads/1/3/2/6/132683484/9652831.pdf
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5fcb1bc6cc4a0.pdf
    • http://dreabling.online/basic_business_math_word_problems_with_answersn0a4n.pdf
    • https://cdn-cms.f-static.net/uploads/4450634/normal_5fd2d085ceacd.pdf
    • https://cdn.sqhk.co/panufarubel/fRihihb/how_to_enter_gin_rummy_plus_cheat_codes.pdf
    • https://kerawitoges.weebly.com/uploads/1/3/4/8/134878251/3161093.pdf
    • https://fusewexe.weebly.com/uploads/1/3/2/7/132712136/xatilizilekerutapex.pdf
    • http://workmonster.net/melhor_forma_de_acender_churrasqueira_com_oleo545sb.pdf
    • https://dejerolet.weebly.com/uploads/1/3/4/4/134444382/b87a4c.pdf
    • https://static.s123-cdn-static.com/uploads/4443819/normal_5ff1ca3d34672.pdf
    • https://nikatomorufaxeg.weebly.com/uploads/1/3/1/4/131437252/949877838e7d.pdf
    • https://tatabakag.weebly.com/uploads/1/3/4/8/134885094/5788727.pdf
    • http://luminar4-download.xyz/tanukagujepuwolunetoleymeg7.pdf
    • https://ponirusorigimo.weebly.com/uploads/1/3/0/7/130738629/mixumekija.pdf
    • https://zakutawevuvukug.weebly.com/uploads/1/3/5/9/135970657/3976975.pdf
    • https://luvemolovod.weebly.com/uploads/1/3/4/3/134305721/a36e01a4d1f.pdf
    • https://cdn.sqhk.co/bisadumiza/hietWhh/kmart_duck_erasers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jewizopukuni/seidels_guide_to_physical_examination.pdf
    • https://s3.amazonaws.com/dujepav/soul_movie_player_app.pdf
    • https://s3.amazonaws.com/xifabilejilab/glassine_paper_sheets_for_sale.pdf
    • https://s3.amazonaws.com/viromibukoleliw/36318546328.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_off00019bfa.bin
fb724758b6940bca7c5456f8f9cbb5538fe7bb99ccb4034edb4820e1da21f3c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19BFA 5100 bytes
font_01_sfnt_off0001ad76.bin
d44be281e9c92792016960c47041ac2961ec0396c8b8489f1b0c4e178fce6156		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD76 11920 bytes

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