Malicious PDF — malware analysis report

Static analysis result for SHA-256 d091eaee64861df7…

MALICIOUS

PDF

69.7 KB Created: 2020-11-18 12:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3131a824e8302fa0a7ed826345331ccc SHA-1: ef35e779759ce299b64c399a9b2b6a1e44e8a2de SHA-256: d091eaee64861df7e691bbccd24c2248a4ec91b4b134a5686893b0ccd972a68b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of external links suggests an attempt to redirect the user to malicious content or download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/aws?utm_term=lightning+mcqueen+coloring+sheet+print PDF link annotation
    • https://zozesikijep.weebly.com/uploads/1/3/4/5/134586683/2085713.pdfIn PDF document text
    • https://jotujovogubiraf.weebly.com/uploads/1/3/4/6/134627891/b31149e3bb.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/pululusodogi/46413307366.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/58891967592.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/81244178433.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/networking_interview_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/ak_47_song_pagalworld_io.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/conservation_of_mechanical_energy_worksheet_roller_coaster.pdfIn PDF document text
    • https://s3.amazonaws.com/damevusom/76669685995.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/41909249818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2917875a-604b-4dd4-b5f2-1cec05aa920e/lisibuvonidelotixuselawum.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_off0000d373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 5204 bytes
SHA-256: 02619e8747ca2f4b0761b229356351d77c80a883256286a4aeb8d54e34df29dd
font_01_sfnt_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 10820 bytes
SHA-256: b78b2e0a23f1c6b914477f751ee79df0886909be23251199a5e349cdf43f8da4

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