Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d91f9d96824c8b1…

MALICIOUS

PDF

108.5 KB Created: 2021-03-23 04:12:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: da0968960e236cccf7f709f9aada3691 SHA-1: b716153d527335c7107d0de173cc1e9463989340 SHA-256: 2d91f9d96824c8b10289c4f3f837e7d874bba4c6ccacfa4d9f711fb17a722d5d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or phishing lure. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=pushing+the+limits+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474739/normal_601f67c316a2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_601d8108771ef.pdfIn PDF document text
    • https://busejutepegojo.weebly.com/uploads/1/3/4/7/134773147/dewamomo.pdfIn PDF document text
    • http://bimupodum.iblogger.org/do_air_filters_filter_smoke.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/b0e575b0d65804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_6023e9a05ae34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakerubigama.epizy.com/sistema_analogico_e_digital.pdfIn PDF document text
    • http://weragugu.rf.gd/future_authoring_program_free.pdfIn PDF document text
    • http://danofef.rf.gd/kidoje.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_f1b8b443233c482aa7e157b54e4fe9f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3e8447-609e-4bfc-9d8c-e53e9f994f61/gileseretapoduvisafolalaw.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_830a13552b6c4cc48f6bd8f87152f77f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f80ccb67-67b3-4199-8158-211eddf631cd/luzaruwosadomenibo.pdfIn PDF document text
    • http://fifofiboveligaf.rf.gd/gugodimuvik.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_off00016e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E09 5152 bytes
SHA-256: e1ce56b58328eaf181df0a64ab10ba18bdb08c1a97c28b54779381668c48b25c
font_01_sfnt_off00017f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F73 11188 bytes
SHA-256: 580a1eeb6b96146cb70aeba403613125709ed5b3c13c6e1e21c0f0b53a6d5d6a

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