Malicious PDF — malware analysis report

Static analysis result for SHA-256 907a57c0a806bba9…

MALICIOUS

PDF

93.7 KB Created: 2021-01-10 18:52:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ca3f941811e42e3310efe8ae6aea4c7c SHA-1: e52541908e335c24e2ef278d2a9638dc49797d3f SHA-256: 907a57c0a806bba9f8a807a52ac6247b446a3b96539dd541664834571c66e7ea
142 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and a 'download button' lure suggests an attempt to trick the user into navigating to a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=creative+keynote+presentation+templates PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474985/normal_5faf473c75794.pdfIn PDF document text
    • https://site-1167955.mozfiles.com/files/1167955/15871792978.pdfIn PDF document text
    • https://cdn.sqhk.co/boxumiza/geji87c/xitodap.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/xarovimati.pdfIn PDF document text
    • https://site-1197643.mozfiles.com/files/1197643/95865312886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5f8fa7bc53a1e.pdfIn PDF document text
    • https://pisilobeko.weebly.com/uploads/1/3/4/7/134728547/302d091549f.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4045700.pdfIn PDF document text
    • https://site-1166680.mozfiles.com/files/1166680/inotia_4_mod_apk_no_high_damage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5fbeb40c37168.pdfIn PDF document text
    • https://site-1186310.mozfiles.com/files/1186310/galaxy_wars_squadron_mod_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00013429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13429 5096 bytes
SHA-256: d309ff1d1a8b50e841ec126cccd8c5340c416d0cb17381c848d123b56b083851
font_01_sfnt_off00014575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14575 10664 bytes
SHA-256: 616bbd2f57c8cbd25c8c63f9a85fcf122f5502090099e2c6c64091d25b4146a8