Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33083634437cb90…

MALICIOUS

PDF

66.4 KB Created: 2021-01-30 01:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 128cb1fb2b709e17b56c054b9879c891 SHA-1: 81636ae66fe8832f03faae4a840e3a426152ff2a SHA-256: b33083634437cb9075c007b1f512e825000ed00e6b263d56de0f2c73207ef49f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://druttle.ru/123?utm_term=mumford+and+sons+thistle+and+weeds', suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure indicates a malicious document designed to redirect users.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=mumford+and+sons+thistle+and+weeds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454182/normal_600ba64babb0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5fe367945a96f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5fe099d429dad.pdfIn PDF document text
    • https://zalekekowijix.weebly.com/uploads/1/3/5/3/135346798/gajazif_kiwematekudaw_suroratitu_sopikixasibuma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411926/normal_5ffb278474c67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_5fd9f7ad75a34.pdfIn PDF document text
    • https://fepexugoroba.weebly.com/uploads/1/3/4/4/134469665/kolutag_zaxojemew_weporivafuxevum_pudavem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504788/normal_5ffe604f3029b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369656/normal_5ff2c663cf13b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378628/normal_60075b54c411a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_6013a89183a01.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/323258.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/vuxopak-liluruvamozu-miliman-tusafesolow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/geraromu/online_magazine_website_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/46691118481.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/bloodroot_forge_tank_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/spider_card_game.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/7922617897.pdfIn PDF document text
    • http://febarufowit.epizy.com/padajunukis.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_off0000c6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C7 5244 bytes
SHA-256: cc443a14f1c526539c3af65a77d4af3274b19a9088c9a4f287502cec52b513ee
font_01_sfnt_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 10612 bytes
SHA-256: 364c2156fe76c50dffcf7d1db2e105245fd6d259d6edf43b564ac417569af4de

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