Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf24df96f006aa2…

MALICIOUS

PDF

65.0 KB Created: 2021-02-16 07:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d3cf9ef4d6848aa07ef1db030d0f81d1 SHA-1: edcfcacee5a3f1ccf2730480ba714b8bfb62d257 SHA-256: dbf24df96f006aa2a02aaae95b0951761243a1ccc790da1786a4aed7898984c8
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

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://jacksth.ru/strik?utm_term=the+little+engine+that+could+book+cover PDF link annotation
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/3902093.pdfIn PDF document text
    • https://cdn.sqhk.co/gafokoru/higgeQh/89406820563.pdfIn PDF document text
    • https://xalofaba.weebly.com/uploads/1/3/5/3/135339869/vepewapezebivotebo.pdfIn PDF document text
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/milubatep.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/vibnmhd/50928011732.pdfIn PDF document text
    • https://cdn.sqhk.co/tizudukokeni/PVhflLW/last_shelter_survival_heroes_guide_priam.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/dixunine-bipexe.pdfIn PDF document text
    • https://menafemudiwifog.weebly.com/uploads/1/3/0/8/130813668/nigijuwutumaneg.pdfIn PDF document text
    • https://remitibomuko.weebly.com/uploads/1/3/4/8/134853657/bujale_ponimugega.pdfIn PDF document text
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/3021022.pdfIn PDF document text
    • https://cdn.sqhk.co/sulubejes/ahdhhhd/fupujapizo.pdfIn PDF document text
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/3917508.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/ehjVgKs/nivazipapafizuj.pdfIn PDF document text
    • https://bojuwidus.weebly.com/uploads/1/3/4/6/134698781/52d7ec843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_60144c1f02741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14E 5236 bytes
SHA-256: 6e6fdb845a280f124116d5543cae7d0f92dc576157e748ed623b9623dcc8070b
font_01_sfnt_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 10560 bytes
SHA-256: e5a527a16ca2a38707d8d680d148bfe2c818b4d3b2ccc55f83228cf1f9fdd7b4

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