Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fc7ab03e09c471…

MALICIOUS

PDF

114.0 KB Created: 2021-03-02 21:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 91b7154746f84286c78b9069a7eb6533 SHA-1: 7766aa3bbdd1f7ac0e34546aeca6cc7b6bb6a416 SHA-256: a7fc7ab03e09c471fd0bdc96963ad0fa62af61831aeb68b5d96f1312cd988a75
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the document structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://crophysi.ru/strik?utm_term=bill+elliott+net+worth+2018 PDF link annotation
    • http://vurovolapoza.mygamesonline.org/xupawafozonipef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402032/normal_60076ff628a73.pdfIn PDF document text
    • http://nalajiboto.iblogger.org/how_to_overcome_zero_gravity.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487632/normal_600bc4f8c9073.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451760/normal_6006483eb42cd.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/43260270382.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/jegijfD/download_game_helix_crush_apkpure.pdfIn PDF document text
    • http://mihetos.xyz/big_jambox_battery_deadq5xa0.pdfIn PDF document text
    • http://bt-management.website/anlage_vermietung_und_verpachtung_20167rjb8.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/the_secret_rhonda_byrne_movie_trailer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jepisaf.epizy.com/mevagen.pdfIn PDF document text
    • http://dewelimu.epizy.com/arcsight_esm_7_admin_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17406 4836 bytes
SHA-256: 520d12eeb0b5d95a7aa1ad3e590d2e20dc8dbacc4c6c80371a6ca5545ec9b6e2
font_01_sfnt_off00018473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18473 11768 bytes
SHA-256: 0f3351cc2339292b72231f7d963137925c99c3e09ce1c3834ad7f6fb0b037786
font_02_sfnt_off0001ac93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC93 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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