Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c17ad4fc9148202…

MALICIOUS

PDF

72.9 KB Created: 2021-02-18 09:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 854b524cdb907cda00467ddc9fe21bea SHA-1: 0ac90a7705a705d07cf50511f6eabc3dd68f1860 SHA-256: 4c17ad4fc9148202ca0db4e2efff4a8c814956438052ded1e5e71a726845a709
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains text related to 'Huckleberry Finn' and the wkhtmltopdf application, suggesting a lure to external sites.

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://jacksth.ru/strik?utm_term=huckleberry+finn+chapter+10-15+summary PDF link annotation
    • https://pafazemewo.weebly.com/uploads/1/3/4/5/134517711/9361751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527164/normal_5fca906a92d98.pdfIn PDF document text
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/689528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_5fdb8e1cb1f39.pdfIn PDF document text
    • http://dfwshootersupply.com/nifuvubosefazagikes04s.pdfIn PDF document text
    • https://temeromaxuzi.weebly.com/uploads/1/3/4/7/134745627/6795708.pdfIn PDF document text
    • https://bujovuve.weebly.com/uploads/1/3/0/7/130738596/1745564.pdfIn PDF document text
    • http://zhigina.ru/amu_controller_phd_form_2019nb9yn.pdfIn PDF document text
    • http://eurostore.info/adobe_signature_certificate6i9as.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_600fea851640a.pdfIn PDF document text
    • https://duwelivupegated.weebly.com/uploads/1/3/4/7/134711348/7248d0a810b43a.pdfIn PDF document text
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/bunutajuzorojozoso.pdfIn PDF document text
    • https://tolixolosunep.weebly.com/uploads/1/3/4/4/134403343/jixili.pdfIn PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/kapilo-jolebetufevoxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/starcraft_2_heart_of_the_swarm_campaign_cheats.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/ditusebukokelikasadafunol.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/hit_the_road_jack_sheet_music_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/18937732929.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/80742977078.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/nezonawewufopuxuma.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_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 5872 bytes
SHA-256: baa8e8f41de7ac0d3e17c4e9f340e6be2d512bc153b8c01079055038e66d7806
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 9960 bytes
SHA-256: da2bc174a7ddad8f33f10070b1c67a99d106c25c00d92cb733457879b64fec77

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