Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af6c57b50a55791…

MALICIOUS

PDF

77.0 KB Created: 2021-05-25 09:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4abc476f65025739e8e36052c1774816 SHA-1: 8926d7df284b806d78810b1fb2971f84d6018c32 SHA-256: 0af6c57b50a557917dbbbbf2a322d515473bcbfcc616cbc0b44f7831dd365dc9
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and the ClamAV detection indicates it's a phishing trojan. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jottigo.ru/strik?utm_term=how+to+add+bluetooth+to+lg+smart+tv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410703/normal_601b27cb252d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489255/normal_5fc5f184084e9.pdfIn PDF document text
    • https://tutamakut.weebly.com/uploads/1/3/0/7/130776204/sitokaru-pexotab-bilopefakexopez-sominexuwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495269/normal_6020cb07dfb4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_60219baa2c65a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_6049e979c091a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504870/normal_604a39e84519d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448548/normal_5fedc91ebb222.pdfIn PDF document text
    • https://lonopenofof.weebly.com/uploads/1/3/4/8/134895818/75d154cd32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_600734658d64d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_6023ee376269c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploaIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/01bc8f99-d87d-4cc5-85ba-7a92d8b19bfd/test_de_zavic_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2596f711-26b0-44a5-b45b-b0634280bfe2/windows_10_cmd_admin_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1caab1-52e3-499b-a6cc-a64c0f52abe7/death_note_manga_sequel_2020.pdfIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/cd5e93c3-5c91-4c5a-a5b6-7fa2e4ae0c0b/the_endless_river_pink_floyd_vinyl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5954046b-7baf-4714-af58-b66ec131ae01/how_to_get_unlimited_money_in_gta_5_cheat_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bcb84d1-53fe-42d8-bddb-2a25b3d584f3/carry_on_baggage_guidelines_southwest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa7f59c-6939-4d43-b6e2-ae94f3b842a4/15618873298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6cc8676-e00a-465c-bf4f-83046ad4082c/fadusamodipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52955b0c-d837-4b2d-aa4c-ec854ada5330/loneti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6376047d-6149-43ad-9549-f8043a3b4590/75637424253.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_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 5492 bytes
SHA-256: 0c4dcde1344f0264b7e8a168db278ef9ef2388f6106c285ace053f632b1e49a3
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 11004 bytes
SHA-256: 46bdde7e2f32904e0f22fa1fa390e22eca8e76c24a59ff1132626b6d5fb77b91