Malicious PDF — malware analysis report

Static analysis result for SHA-256 37934931b4a86203…

MALICIOUS

PDF

92.0 KB Created: 2021-03-28 23:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 57cf77aa2d4e2ad2c8b8deabd3ee3662 SHA-1: 233dc117602958179f3616035dd6783e3be07e08 SHA-256: 37934931b4a86203731e61ed228e246b8e55b8de4709330585f5d540f1da232c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDFs, suggesting a link farm or phishing operation. The primary URL, 'https://ponafet.ru/wix?keyword=player%2527s+handbook+d%2526d+5e+pdf+download', is likely a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://ponafet.ru/wix?keyword=player%2527s+handbook+d%2526d+5e+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418972/normal_6053b95f0ec12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476270/normal_5fe22feed58e8.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/ef9jcjb/37159462120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_5fdac97d50f9f.pdfIn PDF document text
    • https://cdn.sqhk.co/xapewiwud/hfgesKc/h_and_r_block_close_to_me.pdfIn PDF document text
    • https://cdn.sqhk.co/wudajelu/gizosFg/34615462847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470521/normal_6047049c5a96f.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/jdPsAtJ/kazarman_to_jalal_abad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_604ce23357843.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_5fe4a8d865f9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451221/normal_5fde547e87ae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_6018bcaa49228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_6053f08cb6284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384459/normal_5ff007cb35dd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/34863489018.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/66957506173.pdfIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_0b3a5d53e74e42498987b9ea99b65ee3.pdf?index=trueIn PDF document text
    • https://38c8c62e-1823-4c1e-8220-bc61efcc8a1c.filesusr.com/ugd/c24b9b_f0b59c2420b540c5a0f953a2da77506b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubafezin/microsoft_sculpt_comfort_keyboard_mac_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/academia_boa_forma_sport_center_jardim_helena.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_off0001230d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 5256 bytes
SHA-256: 51c333e8c63776273d455a9ae5e40fbbc0a679f35caf6c8cbeb67410b485a856
font_01_sfnt_off000134ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EA 16732 bytes
SHA-256: 4bd7d3d9b27080b8d971928a73dc73507cf042771307ace42dbbc8175e672368

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