Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a3298e42c70f95…

MALICIOUS

PDF

72.6 KB Created: 2021-02-18 20:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 399e260ff98c7027303b9cfdbad17632 SHA-1: 5efb76bb144168b616e8a07af74608a06aceb408 SHA-256: a5a3298e42c70f95964d73f781bbf68d2a8f824bc542213e1b789198f2bf1c1d
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. One prominent URL, 'https://jacksth.ru/strik?utm_term=crown+xls+2500+service+manual', is presented in the context of a service manual, suggesting a social engineering lure. The presence of multiple unknown reputation URLs and the PDF's structure indicate it's likely a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=crown+xls+2500+service+manual PDF link annotation
    • http://zarabotok.space/tetenevipemumedulelziesd.pdfIn PDF document text
    • http://znakomstva18x.site/kanoxomunasadutifulaskgbh0.pdfIn PDF document text
    • http://savadaqwe.space/gerbera_cultivation_guidegs0h7.pdfIn PDF document text
    • http://naturka.space/xoxetuvogikudmdhoz.pdfIn PDF document text
    • http://garant-ritual.online/bubble_genies_level_1072t4mm.pdfIn PDF document text
    • http://pro-konditer.com/77858635158mq4dp.pdfIn PDF document text
    • http://wersita.fun/putanivetawibuvehv41d.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/zalijopuzarobotesig1oju.pdfIn PDF document text
    • http://salebox.shop/analytical_reasoning_mcqs_with_answers2ecx4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jodonurinifos.epizy.com/grammar_rules_book_6_answers.pdfIn PDF document text
    • http://wajiletum.epizy.com/twist_of_the_wrist_movie.pdfIn PDF document text
    • http://zaximibirada.epizy.com/49750333037.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/agricultural_risk_management_strategies.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/vunijosetidamudila.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/sky_sports_live_football_score_center_apk.pdfIn PDF document text
    • http://punegisegavugaf.epizy.com/82347342418.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_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 5468 bytes
SHA-256: 40992fbc11d7c3ecb7f79d1d9b195df8bd7c3e5653b5aad0ac542456ac727ed1
font_01_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 11520 bytes
SHA-256: 2d6eff411b6d607f89a37338dda011624b6a8124714f783c4a6c42f1fd76ad34

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