Malicious PDF — malware analysis report

Static analysis result for SHA-256 042283974a9aef12…

MALICIOUS

PDF

76.6 KB Created: 2021-05-23 19:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f332c0ba63a5b575eb9087384b98950f SHA-1: e8fc2f77ef952a675718abda83985bd325c503ce SHA-256: 042283974a9aef12d89497cc86f12d806320583904e5c50ce9f85265bb181c6a
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://jottigo.ru/strik?utm_term=does+collagen+peptides+build+muscle, is likely part of this distribution network. The document's structure and heuristics strongly indicate it's designed to redirect users to other sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=does+collagen+peptides+build+muscle PDF link annotation
    • https://zukafetovozod.weebly.com/uploads/1/3/1/6/131636890/sifotuxaxewatud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451737/normal_603feb351d616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482230/normal_60194ac274186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_603e8d1c45646.pdfIn PDF document text
    • https://murunabijijot.weebly.com/uploads/1/3/5/4/135401069/6944710.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/lixenifokilaxuj-dejazetusazij.pdfIn PDF document text
    • https://teregurejojexol.weebly.com/uploads/1/3/4/8/134879353/4523773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447433/normal_601724815a9c9.pdfIn PDF document text
    • https://wekubobezug.weebly.com/uploads/1/3/1/3/131383536/7229160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486984/normal_605db11752d51.pdfIn PDF document text
    • https://xenolato.weebly.com/uploads/1/3/4/8/134868471/monivinutitolerumoxe.pdfIn PDF document text
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/2313032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492892/normal_603598a3e922b.pdfIn PDF document text
    • https://pitulero.weebly.com/uploads/1/3/2/6/132683003/kojab-zoliwuxo-ponalegit-jajobolu.pdfIn PDF document text
    • https://nulosumewure.weebly.com/uploads/1/3/4/6/134645663/givuwepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383573/normal_6064943116ff9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378621/normal_5ff24059dad47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_60107afba7dbc.pdfIn PDF document text
    • https://tedotedonux.weebly.com/uploads/1/3/0/7/130775879/b39059710.pdfIn PDF document text
    • https://ladukupubavar.weebly.com/uploads/1/3/0/7/130776836/586b94667d653.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/pazatuv/kolijadamowenafimebip.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/marshall_mcluhan_the_medium_is_the_message_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/castilla_la_vieja_dionisio_ridruejo.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_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 5436 bytes
SHA-256: bfcd253b53e8087455fd528c3980c8d8df7655a362d6ad059afa8f29d2779311
font_01_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 10772 bytes
SHA-256: e3241300d5a239e1995ee87afe940ac673e9fce8c39b308a718b6f386b8a2b1d