Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a395b57da224fc4…

MALICIOUS

PDF

96.1 KB Created: 2021-05-21 22:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8da314cac9adbc00a3699b0cc7345864 SHA-1: c86cd5760c4dce456d57031ea26a5c8406e996dc SHA-256: 1a395b57da224fc4cf2a22c6087c8476cb1d7d7d3530c2404a9b7e6bdc1a4e0d
236 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains multiple external links, including one pointing to 'jumiwimov.ru', which is flagged as an SEO redirector likely used for credential harvesting or MFA abuse. The document's content and heuristics strongly suggest an attempt to trick users into providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://jumiwimov.ru/strik?utm_term=credit+suisse+global+login PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499656/normal_602b4b8ec51b4.pdfIn PDF document text
    • https://govodiroruje.weebly.com/uploads/1/3/0/7/130775462/vegexepeloxozur.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/75cbc3ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477173/normal_603d5f714fc3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_602efd334d811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_606079383a097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_602bf697096c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459936/normal_604d2edf8204e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478387/normal_604625b8247d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_6057b6e0d4bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_6026b87eac250.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/sagotomagin/physics_1250_lab_manual_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/free_bollywood_songs_video_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/vunetubapabar.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/50541772382.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/difference_between_budgeting_and_planning.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/harry_potter_wizards_unite_traces_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/balochi_dance_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/66973049914.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/2nd_and_3rd_law_of_thermodynamics.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/aortic_stenosis_treatment_guidelines_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/mejubidub.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_off000138b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B7 5040 bytes
SHA-256: c3765a28952bb10ca112604591003dfe7fb6f37e25cc1ebbb8ce60509ab98184
font_01_sfnt_off000149db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DB 12316 bytes
SHA-256: 5584c02e56fbead3ba8162049345d77a107816b6cd9ef58e2de030aaf11246ec