Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9773c72627faf4…

MALICIOUS

PDF

74.8 KB Created: 2021-02-22 14:20:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2f515f154f67ffa36b76e0c73e8f8950 SHA-1: 681fc6d9d850f97f30dbbc96a474772bdd235ad4 SHA-256: de9773c72627faf486b743d3cc11b3eba3869107eef05577e5be3aea85cf78f8
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a deceptive link farm. While no scripts were extracted, the presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious 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/123?utm_term=mapa+de+riesgos+la+paz+2016+pdf PDF link annotation
    • https://cdn.sqhk.co/kobewudojuvo/igjbibP/s._t._g._spartech_germany_gmbh.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/hdTioLT/naval_frontline_regia_marina_update.pdfIn PDF document text
    • http://strgb2.ru/apache_jmeter_2._11_freewui5r.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/f9PZxSu/writing_a_small_business_plan_template.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/bso07sR/reaction_trainer_for_pubg_free_fire_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/jhhjiht/dobutesetotun.pdfIn PDF document text
    • http://huseyincanx.com/why_is_my_apple_keyboard_not_working_on_my_ipad_proe7j2y.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/rgdrias/winagubatefogarujurixulu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wirirarosutuki.epizy.com/nexesesotu.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/rokiritewudalu.pdfIn PDF document text
    • http://bajivuselome.epizy.com/67438525600.pdfIn PDF document text
    • http://rusozetowozo.epizy.com/types_of_phobia.pdfIn PDF document text
    • http://lalejifidesuwo.rf.gd/mibeteravas.pdfIn PDF document text
    • http://vudubarexofibuf.rf.gd/xowekefefo.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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 5744 bytes
SHA-256: df04550c8071aac317063e7204847b17dbc9fd6955c2065bed9c3d12a081c61d
font_01_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 12448 bytes
SHA-256: 60763c5a7c7e1c5ad9ae54c56f1b01efa6016c8b0b550710bb89748612d2589d

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