Malicious PDF — malware analysis report

Static analysis result for SHA-256 6654d5433a4db7fd…

MALICIOUS

PDF

70.4 KB Created: 2020-11-22 01:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2feb4d4ab4cf40b0d464501d04776c4 SHA-1: db5307fd393f761fe9ec00739b8771817e71a3bf SHA-256: 6654d5433a4db7fdb9c1bea3988389aeedcb93664e92d858f63299b65ca01b4f
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, many of which are likely part of an SEO link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, potentially for credential harvesting or malware distribution.

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://trafffe.ru/aws?utm_term=vertex+form+of+a+parabola+equation
    • https://seforurusux.weebly.com/uploads/1/3/4/1/134131879/juxuxipenegewo_tedozagegax_woxesetelo_saxole.pdf
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5f93bcb529459.pdf
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/bbbbc57.pdf
    • https://babunugigexi.weebly.com/uploads/1/3/4/5/134582988/pukuzevisivije.pdf
    • https://xogofodaromaf.weebly.com/uploads/1/3/4/3/134387758/8647786.pdf
    • https://wiwusazefaxowo.weebly.com/uploads/1/3/4/4/134457051/mofobitowovufa.pdf
    • https://cdn-cms.f-static.net/uploads/4392210/normal_5fb6dfc8ab278.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nawuvud/xulebe.pdf
    • https://uploads.strikinglycdn.com/files/891db286-4067-4842-84ae-22effa9ae7de/who_were_the_wright_brothers_book.pdf
    • https://s3.amazonaws.com/jukoxisojow/synapse_x_free_download_mega.pdf
    • https://uploads.strikinglycdn.com/files/d3382fea-2c7e-4bed-b7b1-e33655d01f4e/kebat.pdf
    • https://uploads.strikinglycdn.com/files/fb843674-9809-4b17-bcf4-caf99c0ed14a/36698510051.pdf
    • https://uploads.strikinglycdn.com/files/ae1fd9ef-81a4-4c9e-877c-b4ee8659a95a/xitaruwekijeg.pdf
    • https://uploads.strikinglycdn.com/files/8634dfdc-b378-496b-95e5-234102728694/1821512842.pdf
    • https://s3.amazonaws.com/fadedosi/wavaxejagap.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_off0000d484.bin
ffd2af2689187587d74c85e24098ffcc8daea6136ac7d9a54a1cda5e9bc3f9a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD484 5168 bytes
font_01_sfnt_off0000e606.bin
8c03ab5e5233fd0fd16cef18f16c0a913101f1a985e5f128fdb046114f9cf8c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 11400 bytes