Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b83f4ec769d7262…

MALICIOUS

PDF

78.1 KB Created: 2021-04-06 16:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 851da37da1b10771aec58d1e8621fe99 SHA-1: 5f5611b8ee1b6dc49fba4f634d85121f506958c2 SHA-256: 8b83f4ec769d72625120fe9749df71100f7838f7c87705bed078fc60f3296cfc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for credential harvesting or further payload delivery.

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://seumenha.ru/strik?utm_term=ipad+mini+5th+gen+apple+pencil PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5ff8b76fcfd0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503279/normal_600330b7f0e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_606087e59e069.pdfIn PDF document text
    • https://mamumudud.weebly.com/uploads/1/3/0/8/130814078/3820239.pdfIn PDF document text
    • https://daxixulo.weebly.com/uploads/1/3/1/0/131070202/177409.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/322d7414d2642.pdfIn PDF document text
    • https://cdn.sqhk.co/baporozade/hfihhhT/autocad_2014_only_crack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389792/normal_6044752fb746c.pdfIn PDF document text
    • https://xifofenanupov.weebly.com/uploads/1/3/4/8/134857182/5940443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_6031bc2160846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458837/normal_5ff3886a432f3.pdfIn PDF document text
    • https://cdn.sqhk.co/buxisinuji/fvxZij7/mikakag.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/kudowo/vubevodubewajeg.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/adobe_captivate_8_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/71668053268.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/larife.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/whirlpool_duet_washer_door_hinge_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/galvanised_steel_sheet_adelaide.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/checkpoint_firewall_admin_guide_r80._20.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/kcc_school_bus_pass_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/unication_g5_pager_antennas.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_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 5272 bytes
SHA-256: 396f646df4d77772d4f6b143210eb13732bc011e46e9e55cb43c76151847c742
font_01_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 11596 bytes
SHA-256: b029c4c24098fb24850bd50643de7dc8d20bd796d64b60ec12491ae1c11cc285

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