Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb1b31f3c7f3dcd…

MALICIOUS

PDF

72.7 KB Created: 2021-03-03 19:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f93471d84aca7e97659824f5ec36ffd5 SHA-1: 80766ad54296ffeee0357d314bd2c847a5a1a6e8 SHA-256: 2bb1b31f3c7f3dcd1550ee8d76aa7635a5ce554e890ef50309e05fe25ab93622
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or malware distribution lure. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9628

Heuristics 6

  • 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.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://nipisod.ru/strik?utm_term=women%2527s+bodies+women%2527s+wisdom+cards PDF link annotation
    • http://nekalakizifefe.22web.org/tifoburidetemapukovup.pdfIn PDF document text
    • https://kijabejinal.weebly.com/uploads/1/3/0/9/130969506/4a5dcc8610e.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/Cia5OG1/vegan_ice_cream_near_me_now.pdfIn PDF document text
    • https://bitusuverutito.weebly.com/uploads/1/3/1/8/131871453/5724484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465930/normal_6035d9c550781.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/bdYROEB/terra_cotta_hex_tile.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/jMgijcG/vukekomafa.pdfIn PDF document text
    • https://cdn.sqhk.co/kemomonil/5JUbuhf/monkey_mania_bankstown_party_packages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498978/normal_6017882b99b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_5fd6e3c4865c4.pdfIn PDF document text
    • https://gifitutopa.weebly.com/uploads/1/3/4/4/134470147/malag.pdfIn PDF document text
    • https://godivibodo.weebly.com/uploads/1/3/4/0/134040440/gikoxesolonip_jiwulesugo_ganuwakov_kapilena.pdfIn PDF document text
    • https://watagejikifawup.weebly.com/uploads/1/3/4/5/134589749/0751a7698.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuvofuniwurux.epizy.com/birilobupizud.pdfIn PDF document text
    • http://rubilogolimof.epizy.com/scoliosis_exercise_equipment.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/41621223008.pdfIn 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_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 5332 bytes
SHA-256: 0cff54bf08daae674049f316c68a62bc42de90a10acad0ebb639013687612933
font_01_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 10152 bytes
SHA-256: c91e827557a48c2b3e0fc5fcc800ce69bd4944d8946d948bf1f452a7c743db1e

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