Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b408b874711587…

MALICIOUS

PDF

78.0 KB Created: 2021-05-08 04:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bd8c0aeb1c70417113ae084b813c9eb7 SHA-1: d26cf6b43ede869b6ed86df2e9b1e1e3340759b3 SHA-256: 08b408b87471158741ba1e480989927da60e2a549bca87057b9cecbd01bb2c32
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to a 'Magnavox tv vcr dvd combo manual', suggesting a lure to trick users into clicking the malicious links.

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://leonvi.ru/strik?utm_term=magnavox+tv+vcr+dvd+combo+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455374/normal_5fd96b0b5bf8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5fe632f569d28.pdfIn PDF document text
    • http://sellamorem.com/how_do_you_relieve_piriformis_painx1y3u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_5fd967daec3ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_605285d03b6b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_602a2fa75d1c8.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/gagodenogam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_605d90b53dfa2.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/soft_tissue_augmentation_principles_and_practice.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500692/normal_5fe3dace77d51.pdfIn PDF document text
    • http://usecabinets.xyz/33477165106j6u8b.pdfIn PDF document text
    • http://dilurijarejo.22web.org/fewapezexamunezetawo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388427/normal_5ffc26b03f058.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://nixomirorubu.myartsonline.com/verbal_ability_notes_for_gate.pdfIn PDF document text
    • http://pisonepegosa.myartsonline.com/49674428280.pdfIn PDF document text
    • http://pupuwejerew.epizy.com/56142423969.pdfIn PDF document text
    • http://merijezogaxik.epizy.com/nationalism_in_india_class_10_in_hindi_download.pdfIn PDF document text
    • http://zetesapoxus.epizy.com/8466689466.pdfIn PDF document text
    • http://xedemigu.atwebpages.com/managerial_accounting_concepts_and_principles.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_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 5068 bytes
SHA-256: e7e8d8012174cd5b6bd0bf94a531c28cb2a6d45af4023887d77dfe276d6aeabf
font_01_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 10344 bytes
SHA-256: 8eb12c250bb085907a54f403db444d81a5cdd158f457bdbecf69b3dbe8e9a068
font_02_sfnt_off00011d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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