Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dae11b62efef215…

MALICIOUS

PDF

66.9 KB Created: 2020-11-14 09:07:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: aec8c6e51da150c260e66ba3a370415d SHA-1: 24b7d5825033fbe1e23046f211a0677ddc2707b0 SHA-256: 5dae11b62efef2156d616a1eae20cfb6d74171f144a847b356a68e4f67b32154
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and S3 buckets, indicative of a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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/123?utm_term=the+walk+richard+paul+evans+pdf PDF link annotation
    • https://kukezuleji.weebly.com/uploads/1/3/4/3/134361302/5439203.pdfIn PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/dorividanob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f87b8b167b7f.pdfIn PDF document text
    • https://fupiloxeti.weebly.com/uploads/1/3/4/3/134380404/zakuwisemum.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/21368b57.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/panalipolifod/mid_night_club_3_cars.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/geometry_practice_tests.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/looking_for_alaska_full_book.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/67917836345.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/wiboviwaresi.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/46929832912.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/tatomofus.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/babel_library.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/93591253281.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_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 5408 bytes
SHA-256: b6f9418175a6ac96f78c63134b1bb75882fdeb7a4c227046af9091db5ced4005
font_01_sfnt_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 11184 bytes
SHA-256: 18ecbb65a6c431321f6e98e32d6896ceef7967e4866d372a9b6dd24cf02810c5

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