Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68aa32312bb4f3d…

MALICIOUS

PDF

79.8 KB Created: 2021-05-14 09:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 087a706bfc7e7597f8ce9905511f6446 SHA-1: 8554034b990e96da0023915d2ab78b036b58ee7f SHA-256: d68aa32312bb4f3dd81501fad0995ab071e3e6cca9e1b0d455e65e96e5746ed0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dugedepap.ru/strik?utm_term=how+to+adjust+temperature+on+atwood+water+heater PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416506/normal_6063f004be6af.pdfIn PDF document text
    • http://weinmvc.net/fumenibamurarafominunarur5p5n.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/iAgcic6/ludovox.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/jeAjeo7/dining_chairs_with_casters_set.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/eCiaLhb/juicy_fruit_snacks_youtube_age.pdfIn PDF document text
    • http://knitfqph.site/kolb_learning_style_inventory_workbook_version_3.11u1np.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_6055223f3ec30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_605f94c7d0a1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_60665f4be4aa7.pdfIn PDF document text
    • http://chambreapp.xyz/bolojoginutedqldc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_602b92d38487d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_604fe43918c58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_602680687985c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5feb84e501c0f.pdfIn PDF document text
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/7e0bd.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/dxlhahf/raid_heroes_total_war_reforge.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/ba2a78119fc3ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_605179f192fd9.pdfIn PDF document text
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/1107119.pdfIn PDF document text
    • http://iblack.space/kiteworks_administration_guide33ki9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500186/normal_603f3a6ad3cc5.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/hd3ghjg/95392250117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e68315c5-aca8-45e6-bb85-0e51829cfef1/bimujorawabixanuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4588fb34-87f6-443c-9c3b-8f1f371b38c6/wavidojedalalokuxutefor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e04d6d4-9d6c-4221-9f62-f8322c59316c/walmart_black_friday_hours_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f03c2f-6dc9-415c-98e5-de72548931f4/troubleshoot_frigidaire_portable_ice_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9479f383-63cb-481a-95ed-fba135f6dd8b/budirosavagizegogoxip.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_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 5296 bytes
SHA-256: bd86b2e275a6c97d57f23839808586de159b6843afc3a8f8935142b7b9eef60b
font_01_sfnt_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 11136 bytes
SHA-256: 4366040f17d1e9dbb500fc6bffaac373207f294384b47f807f12cccd21851e64

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