Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3e9b716343377f…

MALICIOUS

PDF

76.9 KB Created: 2021-02-26 07:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4abe2bf71b5428ab018f0de4aee316b1 SHA-1: 4e5583b3b5c4b1b62320ce2a2166453df2b1960c SHA-256: 8f3e9b716343377fc6d62b93a1791d1a3bf76d8ce2c0c851bdfb7b194efea546
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/123?utm_term=text+structure+5+types PDF link annotation
    • https://zoxanomo.weebly.com/uploads/1/3/1/1/131163640/6778998.pdfIn PDF document text
    • http://xetudevera.22web.org/54144849029.pdfIn PDF document text
    • https://xuxijoma.weebly.com/uploads/1/3/3/9/133997678/zagigi.pdfIn PDF document text
    • https://cdn.sqhk.co/rarugabowutu/Niahj1m/3789228568.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/LhbUGMo/kewetuno.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/why_do_we_use_pointers_in_a_c_program.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/1919145.pdfIn PDF document text
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/b406fa.pdfIn PDF document text
    • https://zabonipe.weebly.com/uploads/1/3/4/4/134487368/jutixe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/tinudegu.pdfIn PDF document text
    • http://gulavofi.epizy.com/borders_for_word_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/ligepoxorupuwimexege.pdfIn PDF document text
    • http://fesenobonirizu.epizy.com/73550416742.pdfIn PDF document text
    • http://pebeminozari.epizy.com/tadezudanagudojeb.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/10259780678.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/stihl_fs90r_weed_eater_string_size.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_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 4928 bytes
SHA-256: ce2495a216f768c916ced171d63bb37010bb895f682b085445c2f435a30a9e19
font_01_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 10384 bytes
SHA-256: fedbdeaf012637ad8818c3ea9deed6fa8fb0e392f678cc40fa9364d2c23458bf

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