Malicious PDF — malware analysis report

Static analysis result for SHA-256 16249d7bfa0fa96f…

MALICIOUS

PDF

73.6 KB Created: 2020-11-25 11:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd3fc24961493a9cffdf04bba5eae39b SHA-1: 7afe24771b19c8cec63ee832fb86de03321032d3 SHA-256: 16249d7bfa0fa96f2d2cd1d3ba9c92d449bb950702b702c6ae7adb3805e4ba34
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

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-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://traffset.ru/aws?utm_term=aua+hematuria+guidelines+2012
    • https://tefuxaforubexo.weebly.com/uploads/1/3/4/4/134446539/totaguvu.pdf
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/7517590.pdf
    • https://bujezabuzi.weebly.com/uploads/1/3/4/3/134310034/5052748.pdf
    • https://figotuzu.weebly.com/uploads/1/3/4/5/134579221/a2b1348.pdf
    • https://cdn-cms.f-static.net/uploads/4374980/normal_5fa2e4fdcaaf0.pdf
    • https://rariborujur.weebly.com/uploads/1/3/4/4/134443596/3717216.pdf
    • https://gupamawuma.weebly.com/uploads/1/3/4/6/134602371/a7ae3e8a66.pdf
    • https://bokakarepexopo.weebly.com/uploads/1/3/4/7/134750167/gizatewedepasas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b07284e5-f056-4e62-b6dd-9feaa54ee0f4/kirifuruk.pdf
    • https://uploads.strikinglycdn.com/files/554fa2e7-70ec-4c6b-946e-49b5d240adb5/55032852213.pdf
    • https://s3.amazonaws.com/wulagisi/tifeximavuwawugeximune.pdf
    • https://s3.amazonaws.com/sakaburepagase/58687067891.pdf
    • https://uploads.strikinglycdn.com/files/ace5974c-98b9-4d46-a49a-a0e2a8c730f9/13243414551.pdf
    • https://uploads.strikinglycdn.com/files/3fc3651e-4b73-4a65-9349-55b607b669ff/dimatemepe.pdf
    • https://uploads.strikinglycdn.com/files/5e90cf14-af0e-4f6e-b29f-e0647c26b54e/36428695782.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_off0000e1e2.bin
02b9a9d81463ad22409361cef13b4d859bd8a5c88f695ac6093c95f04a3238d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 5552 bytes
font_01_sfnt_off0000f49c.bin
4a924746e76ff78264c5bc1b47efcdd944be8aac604bc8f1b0fd373be8ff47be
pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 11088 bytes