Malicious PDF — malware analysis report

Static analysis result for SHA-256 649cccb57512cf75…

MALICIOUS

PDF

79.4 KB Created: 2021-06-09 05:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2d89de265c786944af0f151be069aaad SHA-1: f8d3e27f435b17f783eadf859f9dde0f3011354c SHA-256: 649cccb57512cf75850ecb0c96a6ea1295545d864a4a34b2078129a00f03ab94
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest an attempt to facilitate phishing or malware distribution.

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://dafemum.ru/123?utm_term=vba+worksheetfunction+vlookup PDF link annotation
    • https://pikowezapuxo.weebly.com/uploads/1/3/2/6/132681044/fenajax_putabubis.pdfIn PDF document text
    • https://daxatuvumuna.weebly.com/uploads/1/3/4/8/134863787/3592709.pdfIn PDF document text
    • https://jononosafopobof.weebly.com/uploads/1/3/4/6/134649788/8088603.pdfIn PDF document text
    • https://fuvunubeliratak.weebly.com/uploads/1/3/4/6/134610803/20c6a7dbf82a.pdfIn PDF document text
    • https://jazemajotejavux.weebly.com/uploads/1/3/2/6/132681398/bawabosuzikola-korixukakofupu-gazebizij.pdfIn PDF document text
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/lubukevonubelugugo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://womelilare.pbworks.com/w/file/fetch/144892824/detibakuvugesafa.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/w/file/fetch/144787881/super_smash_bros_ultimate_dlc_character_leak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14bf4256-e89e-4a1a-97ec-de581303b28b/winchester_gun_safe_lock_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d85b1b-8c50-4d1b-bd44-6fbc46cb2690/85739403878.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144792399/luvetoki.pdfIn PDF document text
    • http://tovemubu.pbworks.com/f/27328160871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e84b1a-2174-4f0d-b174-ebe28d4e4bde/what_is_the_importance_and_purpose_of_writing_a_business_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a08ee26-1def-44d6-bf42-acd6d6a28a9c/givoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b98c050-1cd1-415b-949e-66275ae9da46/23607937177.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144428679/59628281791.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144446565/which_one_is_the_oldest_jail.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/w/file/fetch/144586194/can_you_get_a_fake_dna_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7645aca1-fc52-4eff-9497-1dd11890ab0a/bisopesidowotitikimudeb.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_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 5424 bytes
SHA-256: 6ba2e928f6982eac2bafac5f7c66ffd0b23d7a741fc4882473c1ebf20f351d60
font_01_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 16920 bytes
SHA-256: 572eca9a0b81826db492782a8f05fbde778a13a03e7b381d112cb7da902a948e