Malicious PDF — malware analysis report

Static analysis result for SHA-256 09805d9d73755e0d…

MALICIOUS

PDF

71.9 KB Created: 2021-04-12 01:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbcc5492ca1f4dcbbb358c752ea35aea SHA-1: b80e6d94ffc545bd3f52b876b2099d6c07ea158a SHA-256: 09805d9d73755e0dd252ed63107628bad2777c196624b074dff8898d46af7226
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, https://dafemum.ru/strik?utm_term=angle+worksheets+grade+4, is likely used to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-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.
  • 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/strik?utm_term=angle+worksheets+grade+4
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/76f4f9ceb87.pdf
    • https://boriduleloson.weebly.com/uploads/1/3/4/0/134012687/meluzedalame.pdf
    • https://sawagifavemon.weebly.com/uploads/1/3/0/7/130775832/laveradenaw.pdf
    • https://cdn.sqhk.co/dodalowogiv/4gdWggb/98812293389.pdf
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/6674154.pdf
    • https://galidenik.weebly.com/uploads/1/3/1/8/131856819/888ebaa4df3f.pdf
    • https://cdn.sqhk.co/xeveweno/fjf6Lje/billion_builders_mod_apk_happymod.pdf
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/rugotepoze.pdf
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/662390.pdf
    • http://samewejasaka.iblogger.org/bolurojobud.pdf
    • https://cdn.sqhk.co/fopeziriga/3hfijr1/75500362439.pdf
    • https://cdn.sqhk.co/pijavagoke/gaFjfgi/javiruxemuxu.pdf
    • http://gevixadita.22web.org/vikalozupemagamaz.pdf
    • http://tonilukibifed.iblogger.org/burodajarola.pdf
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/wavudikamumawuteselu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wiwedekepumepup.epizy.com/gotasazerati.pdf
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_4793eff8a13546eaace87cfa713e078f.pdf?index=true
    • https://8a83ad47-1dc6-4e38-b726-138de0fe4a7e.filesusr.com/ugd/043c68_b1c4b5a037d943028842fe192d9541ad.pdf?index=true
    • http://pedojup.rf.gd/1121014683.pdf
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_67561ae9d8db4a7181c6d47e55a20b80.pdf?index=true
    • https://s3.amazonaws.com/migivewuwe/far_eastern_group_annual_report.pdf
    • https://s3.amazonaws.com/xoguwavosuje/a_train_9_strategy_guide.pdf
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_c435758580d94890b6eefdd5190275b6.pdf?index=true
    • 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_off0000dc83.bin
5eb2333bc7b5959d5f1405241771ac9907217bc38838b9b03fe27c50d3e5f40a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 5320 bytes
font_01_sfnt_off0000eeac.bin
bd2dba0e49e8eaaf315589e6519e41759aa020c8def314736e774b6af3f78c25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 10484 bytes

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