Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa169ab306236b8…

MALICIOUS

PDF

81.7 KB Created: 2021-02-25 03:00:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b9df122a0ae8b91a47ba7c62dcc79a40 SHA-1: 88d9e2059d0a34cc22e97a20519881e80f46ab81 SHA-256: 7aa169ab306236b8d1a36d91703b141f444b24e44c22c6ee66784bd1413c648a
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, indicating it functions as a link farm. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. The document body, though heavily obfuscated, contains text related to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=can+you+name+the+50+states PDF link annotation
    • https://cdn.sqhk.co/wunasesev/Mjeifie/bell_bottom_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/dCjcicH/rupokuzikipide.pdfIn PDF document text
    • https://cdn.sqhk.co/guposidum/jj9ipdN/19461334642.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/fQB0Hjb/mountain_climb_4x4_offroad_car_drive_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/hhc9sjJ/rezisol.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/E2gejg8/38871138349.pdfIn PDF document text
    • https://tovorugezix.weebly.com/uploads/1/3/4/5/134599805/bikamod.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/a0e0854a82add.pdfIn PDF document text
    • https://jimutovila.weebly.com/uploads/1/3/1/8/131856698/1106358.pdfIn PDF document text
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/598647.pdfIn PDF document text
    • https://lipopujowojirew.weebly.com/uploads/1/3/1/4/131408954/jobekip-mijen.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/jhUjdgj/77256372138.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/heXhj6b/dragon_city_hack_pc_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/niighij/falewidokalasunojadul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/super_easy_crochet_hat_patterns_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/tasupini.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/mkv_video_player_for_mac.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_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 5072 bytes
SHA-256: 63351b5045e8724edebe07458551a042e5d6d29e3601541a9d5cc720eb8b2cd9
font_01_sfnt_off000114e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 10828 bytes
SHA-256: c0250e39a0cfb2a4f9b3604d29eb9bd92fa3f42bbf9dae0d4d3a06f9bd19d068

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