Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfd90e177f71028…

MALICIOUS

PDF

85.4 KB Created: 2021-04-03 18:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fe83f0d27129696c28f17c03d4ca71aa SHA-1: 50a159bc38a6fbc3584614961ecb7d79fdf62930 SHA-256: 2bfd90e177f710289ee83533e5a190e2f9b249fa02876f785679ded288becb71
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to host these links.

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 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://botokaw.ru/strik?utm_term=who+wrote+the+dissenting+opinion+in+mapp+v+ohio PDF link annotation
    • http://bivitajuteje.mypressonline.com/political_theology_carl_schmitt.pdfIn PDF document text
    • http://shoop-fg.ru/babotipixitugumezolurafibpejbu.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/ihhjhao/86362691930.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/rainbow_vacuum_power_nozzle_hose.pdfIn PDF document text
    • http://bivoliku.mywebcommunity.org/frmacos_antiulcerosos.pdfIn PDF document text
    • http://moviesaddaa.online/tanzania_advanced_mathematics_notesgapl3.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/ejhxfH9/75979730020.pdfIn PDF document text
    • https://cdn.sqhk.co/lukapokobejo/hXjigid/ramazikanilinusowilepu.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/ghj8hhs/69314983345.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/how_long_is_ccna_200-301_exam.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/d032772c-5e82-437a-afd2-958e92cbed30/vativabemoxosugamonepibo.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/hs_arena_helper.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_5c2ea410fa164adf82ccf98d8036d509.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_5329ab5e02144eaab104465f732e41eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d416df-3d83-43b2-9478-8a328e788192/vuzapevilofofajiveku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877adebe-f50f-4eb1-bd1a-df9af09ef0a7/37994528092.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/tulip_flowers_images_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/demonstrative_pronouns_worksheet_for_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/hallucinations_oliver_sacks_barnes_and_noble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/728564de-8633-414c-b4e3-f5274faecfba/can_you_transfer_mp3_to_iphone_without_itunes.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_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 5508 bytes
SHA-256: eef1b1f7dd2ea857ee615b919be2398af15f8723c4cbeeaf3b29c73725ccd1bf
font_01_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 11296 bytes
SHA-256: a28fd8abb9662fea0073edef6752eba0fc9ecbddcaa94c826fc86dd272fcd022

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