Malicious PDF — malware analysis report

Static analysis result for SHA-256 966d8f1923a7160d…

MALICIOUS

PDF

76.9 KB Created: 2021-03-04 23:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 50e356c0f3df61935cad5181fbc620e2 SHA-1: c34a18ff4e49c8538bbbe1f7508ca63b58549ba6 SHA-256: 966d8f1923a7160dcb8d6aa018e7af710d61659623b7e4a130b396cdb76a2abf
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with one specifically linked to a search term suggesting a lure for downloading content. Heuristics indicate the PDF is a link farm on disposable hosting, and a critical ClamAV detection confirms it is malicious, likely a phishing or trojan delivery mechanism. While no scripts were directly extracted, the PDF structure and external links suggest it is designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://dugedepap.ru/123?utm_term=how+to+download+books+from+google+drive PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388041/normal_60094ce3a8d94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409840/normal_5ffc87c4bf022.pdfIn PDF document text
    • http://lijamerogavex.iblogger.org/76927448635.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485579/normal_5ff3dbeb7047d.pdfIn PDF document text
    • http://vegemisabuxum.22web.org/tebizibejewi.pdfIn PDF document text
    • http://sizupefujexebov.22web.org/zimapixezoxevegedeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_6012955e55958.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabadebaluke.rf.gd/images_of_functional_organisation_structure.pdfIn PDF document text
    • http://sawozepanoludib.rf.gd/polari.pdfIn PDF document text
    • http://fopogovokikav.rf.gd/2017_chevrolet_silverado_1500_maintenance_manual.pdfIn PDF document text
    • http://zenujasope.epizy.com/71131268368.pdfIn PDF document text
    • http://pinezininefos.epizy.com/vigulivigikarime.pdfIn PDF document text
    • http://zedaziwubisod.rf.gd/47438798027.pdfIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_3243cb2d1b0c4b52a916500461aa0ca0.pdf?index=trueIn PDF document text
    • http://nemunuj.rf.gd/gta_all_cheat_codes_for_android.pdfIn PDF document text
    • http://govatojajij.epizy.com/blown_film_extrusion_training.pdfIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_2abb4f343cb24b2c8c5f2d85acd0358c.pdf?index=trueIn PDF document text
    • http://gotuwutusefaw.epizy.com/52331813479.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_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 5544 bytes
SHA-256: 491de8302aea9649760e4d569f792f98412b234f90b4c9d41fae6132b55f90d9
font_01_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 10680 bytes
SHA-256: 70ecb4103e5578858d61ae010a43e2d81d102554bf2540b6a468b8586ff4f279

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