Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94100c0288e754b…

MALICIOUS

PDF

70.4 KB Created: 2020-11-11 22:08:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4ce9a75d75c335b7594e117ddd677d71 SHA-1: 150d4c8ac43a040e0171a4a3d2a7e00e23cee343 SHA-256: b94100c0288e754b7869d02565d8c345d60359cae5e642ffb724ecb43cc487d1
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/aws?utm_term=sungrow+110kw+inverter+datasheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371514/normal_5f8dbb117fa52.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/mevop_konolivebazol_dijipig_zuxeviwar.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/nisiw_xavilonipub_bazikakelalif_likajija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_5fa5da5b4702e.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/fiwuzewawefujeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5f90fa5747fdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_5fa654d2e143b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5f90006d9285b.pdfIn PDF document text
    • https://roxoxurapu.weebly.com/uploads/1/3/4/3/134307884/4960639.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/92d57f5.pdfIn PDF document text
    • https://rubazepenomul.weebly.com/uploads/1/3/4/3/134324915/5163708.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/9553184b-f0ad-47ec-a8f8-2055f1eadc72/39423261513.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/dufipoga.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/chapter_21_to_kill_a_mockingbird_quotes.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_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 5568 bytes
SHA-256: 5c1684ae673b081689d06804c3d962af8450014be151f1a0b7c3a3693bc9aad3
font_01_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 11552 bytes
SHA-256: 4cf2701807d4de2696c23c1ee7669abe92ee12eab394008ccbc9561ad469b926

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