Malicious PDF — malware analysis report

Static analysis result for SHA-256 0258c7a755ec46b2…

MALICIOUS

PDF

79.6 KB Created: 2021-03-18 09:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01e2dd2a27cd9b1b4b63a42f4366ffff SHA-1: fa1a6ee9f6d0ca2fde10de39911be9cfa54c2e2f SHA-256: 0258c7a755ec46b26a491e097a2e9f7ec8262fcfb91a87b41899408716c90fda
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting services and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic to obscure the true destination or to distribute content. The ML classifier and ClamAV detection confirm the malicious nature of the PDF, likely serving as a lure to phishing or malware download sites.

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://bologen.ru/award?keyword=vernonia+amygdalina+and+diabetes+pdf PDF link annotation
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/bisexosuz-labobilogen-xinigab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465400/normal_6048454451b05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407303/normal_5fe5d6ee3ef55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386074/normal_5ff92f44eb9cc.pdfIn PDF document text
    • http://wemexuj.22web.org/mcafee_data_loss_prevention_11_installation_guide.pdfIn PDF document text
    • https://jasugigikimodo.weebly.com/uploads/1/3/1/3/131383258/c9da2ac.pdfIn PDF document text
    • http://mexawolin.medianewsonline.com/baird_parker_agar_oxoid.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/82413868112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_5fe7416747a75.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/98630827265.pdfIn PDF document text
    • https://popokafiri.weebly.com/uploads/1/3/1/4/131437291/fosewizikam-wovitotu-rijamisenu.pdfIn PDF document text
    • https://dirogine.weebly.com/uploads/1/3/0/7/130775503/xopeko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolunivagoxel.epizy.com/reaccion_de_combustion_del_gas_butano.pdfIn PDF document text
    • http://derijumofode.rf.gd/60806619950.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/what_is_a_coastal_temperate_rainforest.pdfIn PDF document text
    • http://marurutefa.atwebpages.com/historia_de_los_derechos_humanos_resumen.pdfIn PDF document text
    • http://rabelinowizufe.myartsonline.com/what_is_the_best_toilet_seat_bidet.pdfIn PDF document text
    • http://bokatamekal.rf.gd/rofulemajefevabizobegogu.pdfIn PDF document text
    • http://rizibapuzaduxe.epizy.com/counter_strike_global_offensive_non_steam.pdfIn PDF document text
    • http://jagomizaf.atwebpages.com/88775728099.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_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 5568 bytes
SHA-256: 4c1af3269fc738c1935b261f5c9ed0866cc6a68381ce7d9df060a844b334a4b9
font_01_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 11804 bytes
SHA-256: e4767a0b860560abfdb4cf7c3b5ab2cf73901100e815617c62f8596894064ee1

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