Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a37b5cea14e82d…

MALICIOUS

PDF

64.4 KB Created: 2021-06-06 13:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cb0c8955d1cdafc2a7c644f955898760 SHA-1: 22c22735616658456779f93dfa63a195c2e44fcf SHA-256: b0a37b5cea14e82dcb2b01fa770eaa0d3e2581201cc1238a6dae564b73d847a1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to redirect users to malicious content or phishing sites. The primary attack pattern involves leveraging these links for initial access, likely through spearphishing attachments.

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://crewmak.ru/pbw?utm_term=how+to+talk+to+uscis+customer+service PDF link annotation
    • https://xizoputi.weebly.com/uploads/1/3/4/6/134679655/5debb3ab5f5.pdfIn PDF document text
    • https://fukuzemuk.weebly.com/uploads/1/3/5/3/135306557/dunolusafax.pdfIn PDF document text
    • https://sasovonaxefi.weebly.com/uploads/1/3/4/6/134612432/54ac5d498d7fa7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455196/normal_60087dac52f4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424935/normal_5ffdf652e0e08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462982/normal_603eaa2a41c48.pdfIn PDF document text
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/c9925d9351bb.pdfIn PDF document text
    • https://limakeluror.weebly.com/uploads/1/3/4/6/134657352/d58c717bd85c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_5fd9da0c136e6.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4405925/normal_60afe78e16a33.pdfIn PDF document text
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/seresubowaw.pdfIn PDF document text
    • https://ranadapibefa.weebly.com/uploads/1/3/0/8/130874213/1172583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruwomodanom.pbworks.com/f/masked_forces_unblocked_games_76.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8e6ddb-3c72-4743-9360-47c40360eef2/51237799015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2fa8640-630a-450b-82f8-02e8a37b72b1/how_to_reset_jabra_charging_case.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/how_to_download_gta_5_mobile_obb.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/f/63479110015.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144425082/bridge_to_terabithia_book_chapter_1.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_off0000bfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAE 5120 bytes
SHA-256: fa235fda22620a6878f913cbbc7ab8510dd2c1c3a10f4f338e00d695f76f96fa
font_01_sfnt_off0000d118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 10360 bytes
SHA-256: f430695a1554c8f201c44e7752099731233dd01a41db0cf347a79b35dfd7193a

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