Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb25eaeee7e07b60…

MALICIOUS

PDF

79.7 KB Created: 2021-04-26 22:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 66154b59aaf62b389820289ef1c7cddd SHA-1: 0b24f3d21979eb225217bc1eb2aae443e7d74245 SHA-256: fb25eaeee7e07b60c19c075d6d7b9592cafbcf7650829ece5d14f9bf7c059f22
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf', indicating it was likely generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=the+white+tiger+trailer+reaction PDF link annotation
    • https://vuledojovux.weebly.com/uploads/1/3/5/9/135962602/7166568.pdfIn PDF document text
    • http://azakalaza5.xyz/how_do_you_know_if_its_viral_or_bacterial_pink_eye4k377.pdfIn PDF document text
    • https://nodefosodetapa.weebly.com/uploads/1/3/5/9/135978328/6243048.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/eBjhXgc/carson_wentz_injury_video.pdfIn PDF document text
    • https://cdn.sqhk.co/jafipago/hgbijkt/gravity_falls_images_of_bill.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419002/normal_6002449ece5fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377379/normal_60077bd80d933.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/igejcdt/top_100_ringtones_malayalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484623/normal_60547eb25ccb1.pdfIn PDF document text
    • https://fibarivinudew.weebly.com/uploads/1/3/5/3/135387866/c8e3e0fa5.pdfIn PDF document text
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/45fbef887f5.pdfIn PDF document text
    • http://smeshnoykir.space/66045560635jtsxm.pdfIn PDF document text
    • http://trastqort.online/felatimenesikizazemn4tm4.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/cidiegr/best_slasher_build_world_war_z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_600ae4474d859.pdfIn PDF document text
    • http://girlita.space/70078030055sc84e.pdfIn PDF document text
    • http://pe50off.info/moodjuice_shyness_and_social_anxietyq8g55.pdfIn PDF document text
    • https://watoniworawi.weebly.com/uploads/1/3/4/8/134871767/6fdf0078.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/bb1ff2e5-db4a-4e69-80bf-ac0dac2e3f9a/brown_v._board_of_education_of_topeka_result.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c6a1d15-bedb-4b3f-b98c-12839848ead9/17031252611.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_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 4924 bytes
SHA-256: a0b50ea2e43005697aaeb51cbd91b9f15f6f74fe24609fd58495f425f9b03a58
font_01_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 12200 bytes
SHA-256: 1ec398e57b2841fafa9753aead3218587ded46ff038d7698f7f532d1a149c839

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