Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfbb86a44005d15…

MALICIOUS

PDF

86.5 KB Created: 2021-06-12 19:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4c4034ede1a6c8d76f43a7e9054579f8 SHA-1: 04f288a5a00c33c10a6452c72700426c10834699 SHA-256: bcfbb86a44005d1558382e08e14ca5d09ac526df564944d4edaaba93f8c11374
194 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains numerous external links, many pointing to disposable hosting, indicative of a link farm designed to obscure the true destination. The presence of a 'download' lure and a high ML classifier score further support a malicious intent, likely to redirect users to phishing or malware download sites. The ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://infrive.ru/pbw?utm_term=age+of+empires+3+download+for+pc+highly+compressed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366978/normal_60232b5119180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_6045000c54cba.pdfIn PDF document text
    • https://xedukulabefa.weebly.com/uploads/1/3/7/5/137512956/2198808.pdfIn PDF document text
    • https://vugijivanapuxa.weebly.com/uploads/1/3/4/7/134742443/f0e7cc1f.pdfIn PDF document text
    • https://losazutuliwuja.weebly.com/uploads/1/3/4/6/134622760/07668f471acaf0.pdfIn PDF document text
    • https://rokajovata.weebly.com/uploads/1/3/4/3/134376264/6fa7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_603d1aa6ec5cc.pdfIn PDF document text
    • https://foxakiletomuxo.weebly.com/uploads/1/3/4/0/134012751/4514198.pdfIn PDF document text
    • https://diwesosun.weebly.com/uploads/1/3/2/6/132695938/jepudove-sogewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464739/normal_5fd368ea79cd6.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/gelat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489241/normal_604e1c1d6fcfc.pdfIn PDF document text
    • https://voxapuxunud.weebly.com/uploads/1/3/1/3/131381802/3aea5c5e.pdfIn PDF document text
    • https://tokugariwonudaz.weebly.com/uploads/1/3/4/3/134316825/5299e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421476/normal_603750eb8f546.pdfIn PDF document text
    • https://kizatoruzosij.weebly.com/uploads/1/3/0/9/130969146/4027857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_60507e154d1bc.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/2998341.pdfIn PDF document text
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/95fd83734e46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_6052f6ba91512.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478415/normal_5fefaa2cc6100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_603c7162b1330.pdfIn PDF document text
    • https://pigaxapi.weebly.com/uploads/1/3/2/8/132815084/kekit-waturebuma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekunadugaj.pbworks.com/w/file/fetch/144943584/16760176138.pdfIn PDF document text
    • http://jujupaw.pbworks.com/w/file/fetch/144592923/can_you_connect_monster_illuminessence_led_strips.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 5916 bytes
SHA-256: b14daaf2c92e8ce3c098bc18a590df1853a222e840d9d123fa07c84a7ecbcfde
font_01_sfnt_off00010eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 11168 bytes
SHA-256: c687cff723f3f272091a039e4f1b6c1471ed723b4e83369fb01276de9ba51e08
font_02_sfnt_off00013563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13563 16448 bytes
SHA-256: 3f7f6beb0f5865f83039c8434023d34048916fbab515aea8bfee4d6c7e3f3101