Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fed7c4dbe7d9c64…

MALICIOUS

PDF

75.7 KB Created: 2020-12-25 00:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 56c00e04cc737ffae207e2d6bc90fcc0 SHA-1: e4c43e0ac15a7a761e509dae078c965ef87ab27e SHA-256: 7fed7c4dbe7d9c6451b70872b474403f9f71b29063267c53d8dc18aad62d4078
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and embeds external URIs, with one prominent URL leading to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/strik?utm_term=bad+banks+season+2+episode+3 PDF link annotation
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/bukawikogeminunag.pdfIn PDF document text
    • https://nizovekakajet.weebly.com/uploads/1/3/4/7/134740669/vidovejuw-xomadiwujes-tamiximi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/56028347030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19eeb47-1f15-49e1-91ab-14745e01e224/minecraft_school_of_magic_with_the_pals.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/6975753528.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/votovivaget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df029f1c-1c85-428b-b289-e7a6d8e69dba/zolawelulavijerurad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66306190-2cce-4661-a2f9-c393b2c09571/89309012510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0c1387-91f1-4cae-951e-3995fad54840/96206444797.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/15460130529.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/24992503512.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/bepevikigewufipuvamafexoj.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/hunter_x_hunter_episodes_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fomawipafuz/comptia_server_sk0-004_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1228a73-f6bd-44fb-8e59-d6b2df5ef86f/ruzurebemawimeku.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/71127972095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6ada86-2e79-4965-bf54-58549c320c3b/metal_slug_7_leona.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_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 5376 bytes
SHA-256: 9f1d9a7f6260d150a8c4dcb1f8a86d5362ec6c1562dcba6ffa185512ef9bda21
font_01_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 11276 bytes
SHA-256: 55d8fbc47269f50db6caa3a0d227102f4c02bface2b82e51248fa53d638ccb4c