Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57def40a9ef947d…

MALICIOUS

PDF

82.8 KB Created: 2021-03-15 15:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8db12173374dea6566cc65d7fedcfbc9 SHA-1: dc83523b32fc3998b3c2f6b59e00382a32d53046 SHA-256: a57def40a9ef947d4c203dfca6ea8bb167811b5b2732328ea885a94e537126c9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic indicating it functions as a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to the document's primary function of redirecting users to external, potentially malicious, sites.

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://fokemale.ru/award?keyword=casals+song+of+the+birds+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449793/normal_6004cc01f27f3.pdfIn PDF document text
    • https://cdn.sqhk.co/susopavazane/iiHib71/35586156992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_5fd7ad5f10949.pdfIn PDF document text
    • http://zagadadafe.22web.org/zukugutokakozinesotosavo.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/ggchGiZ/limuponuvunoxegodofitib.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/gdEjhjg/terrestrial_ecology_study_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/waxusuxagaki/hethjFQ/tv_guide_bbc_alba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392474/normal_5ff5665a5ac13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372074/normal_5ff36d95200f5.pdfIn PDF document text
    • http://lozuzaragujeb.mypressonline.com/oxford_discover_2_writing_and_spelling.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_6016fcc1e8678.pdfIn PDF document text
    • http://bovotuguf.iblogger.org/42467305636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_602c116e8c422.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488837/normal_5feb16272b8c5.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/cL2jfjx/xifozutonezomorili.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/315228c3-e69a-4743-99e6-7f3d6c7e8ad4/types_of_job_titles_in_retail.pdfIn PDF document text
    • http://ledaruwevegoxu.onlinewebshop.net/behavior_modification_therapy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85e8c18-c140-4cd7-bdef-25b073602571/49117714900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceea1d32-190f-497c-80b7-4dfd0e44a984/2005_club_car_precedent_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e089f5f-fdd9-484f-b042-be8cdf94dabc/topegopuzozebi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 5348 bytes
SHA-256: fdea0b1f1ce4a0b478ce526c36c4131266cb67c32f0416fcac1fc6d8641535db
font_01_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 11056 bytes
SHA-256: 59af38a71bb1cd5497c8f46d56882ddd932a09ff6e540e10c80103da85347bde

Open this report in the interactive analyzer, or submit your own file for analysis.