Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7187fe049962276…

MALICIOUS

PDF

71.1 KB Created: 2021-04-03 12:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe6c22e1c74aafc3dd7fd6aa2b30dd03 SHA-1: 72958924be3edfb995dab2cc7a1d99eaf67c7afa SHA-256: c7187fe04996227689f028e3c7bebda2fa0ad24ca2d6f016b77bd55bf6c1a23f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://pelibifir.ru/strik?utm_term=samsung+rf263beaesr+ice+maker+troubleshooting', suggest a lure related to product troubleshooting to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://pelibifir.ru/strik?utm_term=samsung+rf263beaesr+ice+maker+troubleshooting
    • https://cdn-cms.f-static.net/uploads/4465003/normal_600b38e48b57f.pdf
    • http://gakukuketisalum.scienceontheweb.net/jilevotodisamadirowomi.pdf
    • https://cdn-cms.f-static.net/uploads/4408875/normal_601b0ac7994dc.pdf
    • https://cdn-cms.f-static.net/uploads/4454559/normal_6063031714373.pdf
    • http://riwalimuj.scienceontheweb.net/amrita_siddhi.pdf
    • http://lunagogafoxoj.sportsontheweb.net/68684753499.pdf
    • http://zujewap.mygamesonline.org/hepatoma_adalah.pdf
    • https://static.s123-cdn-static.com/uploads/4367308/normal_5fce264eab943.pdf
    • http://didibemez.scienceontheweb.net/93100710569.pdf
    • https://cdn-cms.f-static.net/uploads/4404512/normal_6019cd079e1ec.pdf
    • https://cdn-cms.f-static.net/uploads/4486363/normal_600e0ee98d1fb.pdf
    • http://wudenufodoroziv.scienceontheweb.net/agentes_economicos_de_circuito_economico.pdf
    • https://static.s123-cdn-static.com/uploads/4379231/normal_5fcf5a9db5ba5.pdf
    • https://cdn-cms.f-static.net/uploads/4383918/normal_60290d45d1d7b.pdf
    • https://cdn-cms.f-static.net/uploads/4383475/normal_601d3d9831657.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jazoxuxorilule.epizy.com/usarec_3.2_example.pdf
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_2ed4573c7b46455788c65be4cbc47e81.pdf?index=true
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_9731a0d2c48e4191bcbaabcb22f5ed56.pdf?index=true
    • http://xufoziminep.onlinewebshop.net/xenotimavebiwemuke.pdf
    • http://nuxijezusuwep.rf.gd/elder_abuse_mandatory_reporting_qld.pdf
    • http://saweridam.epizy.com/46902101602.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_off0000d507.bin
fe986a89059da045d14869e4221b9caf85ae3713ea858ec250ad84dc59ffa00e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD507 6052 bytes
font_01_sfnt_off0000e978.bin
ec558c8e7b9b2b9ae29bda8db2ea530a309c0d54a138e6b6dda5e4c2018b2906		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 10336 bytes

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