Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e49fabb15dc0318…

MALICIOUS

PDF

68.5 KB Created: 2020-11-23 04:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d96661f3a8b11167aa8c2026d868061c SHA-1: 5a4c82c43babcc3186d9694880b83c062a97521b SHA-256: 1e49fabb15dc031852ba003ccd46ab81947226f5b555fe3bb35c7ce9b4510310
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://traffnew.ru/123?utm_term=lady+gaga+the+fame+zip PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452863/normal_5fa10c7737d75.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/57694f.pdfIn PDF document text
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/lujudewidogalod_bojamavur.pdfIn PDF document text
    • https://vokugovu.weebly.com/uploads/1/3/4/5/134598923/de098e5f43.pdfIn PDF document text
    • https://felomadexibeb.weebly.com/uploads/1/3/4/6/134687620/bisep.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/e30a25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410953/normal_5fb6f0668d3a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/096090ab-2c20-4190-81bb-6db849eb951e/slay_the_spire_collector_strategy.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/39211259091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/033699a0-0c59-4184-91de-d4848c777ebd/sejuzolupelepanotozuxusib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd24a11-5327-49b4-90f1-b920367ffedc/42091792383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a486a2-e3af-4a94-a384-e63d538355e7/tuzom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea46e150-2cc9-4ae3-b4b6-284c4e4e8ada/32279099217.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_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 5240 bytes
SHA-256: d69e0f026c17a000485193e55eeb8542feafea7c82706d41ee189e6465d11caa
font_01_sfnt_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 11160 bytes
SHA-256: 73ada2df10b32da957df13e42bdcf7bf0c4aa13d334604eeaa02c0f24b39c3b3

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