Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae355ac5538d6944…

MALICIOUS

PDF

70.3 KB Created: 2020-12-14 04:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b7463619f2bfb9d63721650b460594a SHA-1: b2f0002ed4906fc10c374a6b80eecb68ab6624df SHA-256: ae355ac5538d6944c0c0814b71bbf289fbac53b4d9982913f58ddfb9a4b4630f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/aws?utm_term=avast+antivirus+2018+free+for+pc
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/a7945.pdf
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/f1dfc27.pdf
    • https://gixajukixopa.weebly.com/uploads/1/3/4/8/134877082/pugonaxevovuvopedof.pdf
    • https://cdn-cms.f-static.net/uploads/4464722/normal_5fc2ca7b4aaaa.pdf
    • https://cdn-cms.f-static.net/uploads/4489415/normal_5fae08518d572.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/30a2ee92-8d7b-4cf5-9976-efe2a6c4e68b/woxatimedovaw.pdf
    • https://uploads.strikinglycdn.com/files/c838eefd-a097-4903-9f49-5b45e23618ad/69913556726.pdf
    • https://uploads.strikinglycdn.com/files/894678db-f4e1-40c7-87af-bc25f4f29bd6/pipelefafinogibopoteliru.pdf
    • https://uploads.strikinglycdn.com/files/396bd9ed-3307-4a3d-839c-e23bb5e1c658/rdr2_horseman_10_hungarian.pdf
    • https://uploads.strikinglycdn.com/files/a51598ae-798d-43a4-8b40-df9cf68601fb/bolafep.pdf
    • https://uploads.strikinglycdn.com/files/da7af483-8088-46c0-8119-12b0578a6800/kate_spade_outlet_store_return_policy.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_off0000d5db.bin
57b628a25a163c734bdbb55f7a2a3b9eb6a2415443663daef7b08efab7896021
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 5544 bytes
font_01_sfnt_off0000e8d0.bin
f2befd090e2fb99d68ab248d4dceab979546c572aaaacc753b80b55116bc6249
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 10428 bytes