Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36413788429c6c8…

MALICIOUS

PDF

73.6 KB Created: 2021-05-19 12:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e85a82c6926a240454d8e439b175c40 SHA-1: 754dbe46f6ff049331590b503fb93217e6ad160b SHA-256: a36413788429c6c801880dc641ade7626a525091e55d36729b0ac01acb22d9fe
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://botokaw.ru/strik?utm_term=how+to+use+mistral+electric+oven', which is likely part of a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+to+use+mistral+electric+oven
    • https://static.s123-cdn-static.com/uploads/4401525/normal_5fdda437b452e.pdf
    • https://kujuroledok.weebly.com/uploads/1/3/4/0/134040703/c1d7f272.pdf
    • https://cdn-cms.f-static.net/uploads/4388271/normal_604da6b369209.pdf
    • https://dugubutufafug.weebly.com/uploads/1/3/0/7/130775350/gijomu_zebada_duwejexoxubob.pdf
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/ff45e5.pdf
    • https://cdn-cms.f-static.net/uploads/4462036/normal_601a99a6a773d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bd922a15-e402-4f82-9643-129e40ca779a/nawuzinosidixugumo.pdf
    • https://s3.amazonaws.com/roware/best_high_graphics_android_racing_games.pdf
    • https://s3.amazonaws.com/tugumeb/10110868226.pdf
    • https://uploads.strikinglycdn.com/files/24645683-acfa-4061-b5eb-896a7c75d372/lovavemufepekixulava.pdf
    • https://s3.amazonaws.com/xowasosuf/zoferoz.pdf
    • https://uploads.strikinglycdn.com/files/b7a12308-65d3-4c7c-b86b-1fe509a6205d/83797891414.pdf
    • https://s3.amazonaws.com/legenapi/6759502371.pdf
    • https://uploads.strikinglycdn.com/files/106651d6-5e31-430b-aa30-bf21852a3f4e/pirerovusugimoximula.pdf
    • https://s3.amazonaws.com/jemazejodep/pharma_guide_dahshan.pdf
    • https://s3.amazonaws.com/jamuluvuvava/japexipos.pdf
    • https://s3.amazonaws.com/zukogi/how_does_briggs_and_stratton_carburetor_work.pdf
    • https://uploads.strikinglycdn.com/files/13604770-af65-4cff-bdc2-37c67fd3897b/georgia_limited_driving_permit_rules.pdf
    • https://s3.amazonaws.com/kisagoz/96243325693.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e300.bin
d0bad140ade7aa1da98e416ad21698dbaf353190cd4a6605e2b666751fce8f5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 5060 bytes
font_01_sfnt_off0000f42e.bin
3b089855e0c5cc5515cb4818fa5024128e5698b3d177742a0110fc6b99d55b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 10884 bytes

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