Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1a7be70b12e432…

MALICIOUS

PDF

61.4 KB Created: 2020-11-14 21:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3291530e3fa8b95ebc436fd4a336e04 SHA-1: 7504241a37c088454687200ef3f9f787bbb32fe1 SHA-256: fe1a7be70b12e4321dbc6d6c0b866890b64922299d726fc47e4f7355ca5ce40e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a common tactic for phishing or directing users to malicious sites. 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 exploit users through deceptive links.

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://trafffe.ru/123?utm_term=nispom+manual+2016
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/xatuxuz.pdf
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/sagujesopadoponel.pdf
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/db204.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zarusegibitumet/sorry_sorry_answer_lyrics.pdf
    • https://s3.amazonaws.com/mejigavukolu/96316041594.pdf
    • https://s3.amazonaws.com/dukexajuj/the_ace_family_basketball_charity_event_2019.pdf
    • https://s3.amazonaws.com/fasanag/wadizumasotisejejisowuwa.pdf
    • https://s3.amazonaws.com/sevoga/php_contact_form_template_free.pdf
    • https://s3.amazonaws.com/tomaxade/uttrakhand_govt_jobs_2018_2019.pdf
    • https://s3.amazonaws.com/guwutivupudutu/67635189203.pdf
    • https://uploads.strikinglycdn.com/files/af294e59-1180-43d8-82bf-f59da0775e04/bivixazajatusorififipaga.pdf
    • https://s3.amazonaws.com/jolufozo/88090973702.pdf
    • https://s3.amazonaws.com/kepevipawit/gta_sa_free_apk_for_pc.pdf
    • https://s3.amazonaws.com/pibajuwi/65813975984.pdf
    • https://uploads.strikinglycdn.com/files/e8dd3840-17eb-42d1-bd3c-495c0ed8c6a3/fuvotasuxexolarob.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_off0000b67d.bin
6c5d01e6ed05a0070fd6d64ec312fda6253ce5743bfbc610d1bdc11aea8d8d5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB67D 5316 bytes
font_01_sfnt_off0000c886.bin
20eae835abd04bc920b5642391c4b9cb232c3ce35f285f64c0bef88b37a0e3f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 9556 bytes