Malicious PDF — malware analysis report

Static analysis result for SHA-256 7573cfd9dacb2fdb…

MALICIOUS

PDF

84.1 KB Created: 2021-06-10 10:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7fc01778a06cb8f7a71b4d614b6b105e SHA-1: c4e82cb909578f749735dd55dac4074eebbfcd54 SHA-256: 7573cfd9dacb2fdbca2ecee0e9cfc70f70f1f4882e873b11eade1f658ccb5007
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, particularly the one pointing to 'lozipotod.ru', suggest a phishing or scam attempt disguised as a game guide. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://lozipotod.ru/123?utm_term=american+truck+simulator+beginners+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480580/normal_5fed6590ba428.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416150/normal_5fc8724f73c66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485693/normal_5fddf76b34a29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_605b1065ef75b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_605c7069ed3ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444366/normal_6023d5377277c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473622/normal_6032c0e7c0cb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485443/normal_604b821b37271.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/e42f99c9-d72e-4a62-9e5b-7de456294a13/5e_giant_lightning_eel.pdfIn PDF document text
    • http://kesowununak.pbworks.com/w/file/fetch/144986910/vopexeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3825ac07-31ff-4e42-aba1-1afc3a27aa93/ejercicios_para_practicar_los_verbos_regulares_en_espaol.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/w/file/fetch/145005765/twilight_breaking_dawn_full_movie_free.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/monosacaridos_disacaridos_y_polisacaridos_ejemplos.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/f/how_many_calories_in_a_ground_beef_soft_taco.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/wugifewofarezovo.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/w/file/fetch/144849738/lemobit.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_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 5452 bytes
SHA-256: dee29091cd1cce8ee54a065354243a81aa069c88a82158a9852a61a502f4c53c
font_01_sfnt_off00011c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 11464 bytes
SHA-256: 6f1c40702f3a0c7091d143738f31514cb57ff00d31ea723f558eff0225b1cce1

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