Malicious PDF — malware analysis report

Static analysis result for SHA-256 e592e8e9f40b7c2e…

MALICIOUS

PDF

71.1 KB Created: 2021-02-21 20:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1a5e36746f8e5fb175a39cad8dc013ef SHA-1: c852b2288c94f6f7c9de1d6f115795d2f6364e6b SHA-256: e592e8e9f40b7c2e467fb1513123322f5c213f005975a544a01a681913f9a2b1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=3d+face+tracker+app PDF link annotation
    • https://cdn.sqhk.co/vitimosugu/qwgfIia/xesuwapimadazolavoxemowop.pdfIn PDF document text
    • http://tobalalupuvobiv.iblogger.org/buzupovudajesagan.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/edjgAgj/candy_crush_farm_game_download_apk.pdfIn PDF document text
    • https://basosogufu.weebly.com/uploads/1/3/4/6/134682995/tikaji.pdfIn PDF document text
    • https://wabiwuwisurukim.weebly.com/uploads/1/3/2/6/132682822/1188896.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/wenukezojub.pdfIn PDF document text
    • https://wenudujajavu.weebly.com/uploads/1/3/5/3/135318124/2938401.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/mYjgjbh/space_wolves_40k_paint.pdfIn PDF document text
    • https://cdn.sqhk.co/gapevusa/hh4hgid/world_market_outdoor_furniture_reviews.pdfIn PDF document text
    • http://fovazewo.iblogger.org/venue_report_san_diego_bachelorette.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mazolofoju.epizy.com/deep_pocket_twin_fitted_sheets_sets.pdfIn PDF document text
    • http://pabovabavuwemet.rf.gd/auto_clicker_automatic_tap_2019_app.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/25332957292.pdfIn PDF document text
    • http://fizanotafogibag.rf.gd/33850450476.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE59 4596 bytes
SHA-256: ff90da07ae0aa92fa6134560fa79099eb9ef525d7b2541e6232082a358429977
font_01_sfnt_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 10408 bytes
SHA-256: 7d4b88821e75c85cce490ff85220f8c2fb9f32fcd64950ac7bddac08506063cc
font_02_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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