Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a8e731af84ca06…

MALICIOUS

PDF

45.2 KB Created: 2020-10-05 08:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 15271d9c3556c585d1455e83f44e4953 SHA-1: f5116b02418fa690d54c296945943c3c13233dd0 SHA-256: 81a8e731af84ca06e7df0027fc7da3668c05d82f819c85c8991670af9612bd5a
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://cctraff.ru/strik?keyword=free+software+to+edit+pdf+files+online In PDF document text
    • http://kinojike.whowardwilliams.com/uploads/1/3/1/8/131857631/f6e621f8f5.pdfIn PDF document text
    • http://files.ketsanafoundation.com/uploads/1/3/0/8/130813988/3d2325009f308f.pdfIn PDF document text
    • http://files.bruins4recovery.org/uploads/1/3/0/7/130739525/7558406.pdfIn PDF document text
    • http://files.kwitoskiandassociates.com/uploads/1/3/0/9/130969501/8699403.pdfIn PDF document text
    • http://files.killjoy.info/uploads/1/3/2/8/132816158/444fa6d86d0810f.pdfIn PDF document text
    • http://files.chaneyshrinks.com/uploads/1/3/2/7/132741486/fumajotebovoz_wejeduwiluf_tipoma_nijazarusolo.pdfIn PDF document text
    • http://mowarig.solomonbrookfarm.ca/uploads/1/3/1/0/131070761/gawuse.pdfIn PDF document text
    • http://wesabego.jessicalaurelreese.com/uploads/1/3/0/7/130775403/7481509.pdfIn PDF document text
    • http://gifoninu.syvwindensemble.org/uploads/1/3/1/4/131407440/9785647.pdfIn PDF document text
    • http://files.taylormorrismusic.com/uploads/1/3/2/3/132303238/3530517.pdfIn PDF document text
    • http://winuwoke.wordoflifealaska.com/uploads/1/3/2/8/132815370/4da67bc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6935/3383/files/ironman_range_guide_osrs.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_off0000724f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x724F 5084 bytes
SHA-256: 7dd40989c6d0e6fc1663f92af3836488b9275a0b32a8f5cb5a65e9f2e45712c6
font_01_sfnt_off000083bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83BF 10524 bytes
SHA-256: 6f22f78654a35cbdbf3f62e13ed997637f48947c46f5256b815817f05b71901b