Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd21b5c7ff2eb0d…

MALICIOUS

PDF

84.9 KB Created: 2021-05-29 21:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: eec0cb550309c4e4bd4bcaca71c7274c SHA-1: b8e79262e64565c74e56aa4e17610e159e81f529 SHA-256: cfd21b5c7ff2eb0da11cf458bf922afeafe6d8cf65d5c6810c4cb25946fe3eab
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. The embedded URLs and the structure of the PDF point towards an attempt to exploit search engine visibility for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://lozipotod.ru/strik?utm_term=dollar+tree+locations+in+alabama PDF link annotation
    • https://digutejuwunapon.weebly.com/uploads/1/3/5/3/135325267/poretuzatavunub-benojofozowur-garekitenije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447888/normal_60029705d276e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_600d5cc06e15f.pdfIn PDF document text
    • https://zovezeko.weebly.com/uploads/1/3/4/6/134697242/9591658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_601e02923b45a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495975/normal_6067eb51185ec.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/wezuponopizepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_6018dce95a1a6.pdfIn PDF document text
    • https://pamoxoxose.weebly.com/uploads/1/3/4/6/134656592/kodafunaxigivopudase.pdfIn PDF document text
    • https://depesusexufajev.weebly.com/uploads/1/3/5/3/135351117/9d7acfa.pdfIn PDF document text
    • https://toxilitabosi.weebly.com/uploads/1/3/4/4/134495834/wuvotaki_jofulukamup_jefog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392470/normal_5ff9e66363d16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_60595dd92e5f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479932/normal_6069e8b913369.pdfIn PDF document text
    • https://wudowesowuzoka.weebly.com/uploads/1/3/4/5/134584143/6e22466c7c187f6.pdfIn PDF document text
    • https://guwuribi.weebly.com/uploads/1/3/0/8/130873976/gofab_dodutabifodu_xogemaxanetoner_wefowi.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/gisavexovavajev-bijebenox-danufuxejeda-zuromakolobu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387235/normal_5fcc9a28d28bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/945fded0-d606-4bbd-bf54-718f51256eab/who_regulates_shaw_academy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329610ad-74b5-4d56-a0d4-172afb2bf3a9/me_myself_and_lies_jennifer_rothschild.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3d87bf-0614-489f-9e37-44c0dfbaceeb/dekafufotezusabevuputinit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/499a1562-02ea-4d02-aee8-3bd1f21655e7/bosch_silence_plus_46_dba_drain_hose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7700e23f-b46e-4f75-8de4-6f006049415b/sentry_safe_key_replacement_3f2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1250b7-f4ab-4971-932e-2e7df9618f3b/beowulf_translation_maria_dahvana_headley.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_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 5084 bytes
SHA-256: 41b51442bb00d58fbc442c5c59fe3265586be71dd7715f699f9bea2a0c70472c
font_01_sfnt_off00011e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E60 11708 bytes
SHA-256: b0f1a06a2d2129c75fa15d540a64a6452a58ff09303db42d96b171e47c78548f

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