Malicious PDF — malware analysis report

Static analysis result for SHA-256 642e73d0bdd6e795…

MALICIOUS

PDF

76.4 KB Created: 2021-03-23 18:27:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 69d9dc201c3ec1fcdad38651fc6b21e7 SHA-1: f3ee0ecd8028fe9b653d66e7408d68b86f218698 SHA-256: 642e73d0bdd6e7952f150af1a854976c666421ad6490c1323431a5733bb231af
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=critical+ops+apk+data+obb PDF link annotation
    • http://nugowimabu.mywebcommunity.org/82188737678.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibowaxus/fibhdge/offroad_outlaws_money_glitch_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/EXjiaij/7054949390.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/jajio4p/tebawadebukofop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_60556e8faa31a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5fca1750998f9.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxeje/d5BBCp3/voltage_drop_cable_size_calculator.pdfIn PDF document text
    • http://luxibenuguk.getenjoyment.net/potigale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52cfbdcc-51c1-4e85-ba83-ad74149b4620.filesusr.com/ugd/93d431_1f0c886caee241408c57baba5ab98fdb.pdf?index=trueIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_22a456f7f3104f328145e33db1137c86.pdf?index=trueIn PDF document text
    • http://luxupovokajaf.onlinewebshop.net/wupevufudelokejididakun.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_5d8c0be0cadd48c7a6ab0697737aef03.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_89cfc4a70914427cbef043aa903d4ebe.pdf?index=trueIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_1d9c39cdc4e9441599c76bd57a72816f.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_200ba26b194543b0ab48ed202a63e684.pdf?index=trueIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_a907612ff414495e945003e834340af7.pdf?index=trueIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_b3cbe56ff74841a3b0998c92b9d66756.pdf?index=trueIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_b3d866fe54614511845ab4a3dc3364b8.pdf?index=trueIn PDF document text
    • http://kexomun.myartsonline.com/origin_of_bhakti_movement.pdfIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_41d88863c49045aa9873ecfc16144790.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_783d3785a56648749db7fa1a7a663f5e.pdf?index=trueIn 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_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 5176 bytes
SHA-256: 8b0f6fbad7412da0ee59645148902cf60e2c70f1159bb2dc3b772e3f4b8db63c
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 10724 bytes
SHA-256: b0952ef7ca1fc433fa0a277c28961d49ec48ea275460ab68f812c19745c7aa13