Malicious PDF — malware analysis report

Static analysis result for SHA-256 788f8b79ebdd09ca…

MALICIOUS

PDF

75.2 KB Created: 2021-04-02 11:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64d1bfdcb9778304943b11d3905ee16f SHA-1: 784da626d3e5a3c21f6f0087b7dde70ace1af90f SHA-256: 788f8b79ebdd09ca9c8ae6a4c5095e6e34efde168ae1a354d6e4a6a93152c586
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files with numeric or generic slugs, indicative of a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=five+characteristics+of+an+entrepreneur+pdf
    • https://saxonolofazejel.weebly.com/uploads/1/3/2/6/132681209/0606555d82.pdf
    • https://cdn.sqhk.co/fowipovoji/jcfib8x/easy_sour_cream_lemon_pound_cake_recipe.pdf
    • https://cdn.sqhk.co/bajipugotox/b2iiLOj/40056346649.pdf
    • https://xarugowa.weebly.com/uploads/1/3/4/7/134733051/7225a68d0981b3.pdf
    • http://topukovatawosu.sportsontheweb.net/39958996939.pdf
    • http://zukirudon.mypressonline.com/calendario_liga_portuguesa_2020.pdf
    • http://lusuwivaw.medianewsonline.com/pujexamomexipene.pdf
    • https://cdn.sqhk.co/mulepava/hihiifc/music_mp3_songs_download_telugu.pdf
    • https://cdn.sqhk.co/lajakukilo/cxghshj/wiki_for_cod_warzone_modern_warfare.pdf
    • http://xevojifixifepi.scienceontheweb.net/benim_hocam_tarih_2020.pdf
    • https://cdn.sqhk.co/medujebukoma/0yy3fif/best_template_for_cv.pdf
    • https://palavelo.weebly.com/uploads/1/3/4/8/134891967/lewirikupi.pdf
    • https://cdn.sqhk.co/jebumujo/fjchdhb/1426279670.pdf
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/53dced48fb88.pdf
    • https://vixevugipun.weebly.com/uploads/1/3/5/3/135327752/faxepigig.pdf
    • https://cdn.sqhk.co/sovebiba/hhuTgeh/advertising_agency_success_stories.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nolumuj.epizy.com/clio_2019_legal_trends_report.pdf
    • http://piwakitidi.onlinewebshop.net/12728451501.pdf
    • http://lepetape.epizy.com/ccm_care_plan_template.pdf
    • http://forezepolutaju.onlinewebshop.net/fogukavizenopagusenavi.pdf
    • http://fugewad.rf.gd/nokia_android_phones_list_in_pakistan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b3.bin
af56a551e1abb6df109c325c38ebd74c628db680fdf5ec5008c2606d5c502750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 5224 bytes
font_01_sfnt_off0000fb7d.bin
e4868f72912c7a8554d3d963b8387b49fe3229a88367d53f8d715e48f0d573c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 10520 bytes

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