Malicious PDF — malware analysis report

Static analysis result for SHA-256 e203884c5f1bec68…

MALICIOUS

PDF

81.8 KB Created: 2021-03-30 10:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0235ca7319137c01ffc007b2a3eb56b7 SHA-1: 89d4a7f7def21267a0a7cc8886085dfb77bf7d43 SHA-256: e203884c5f1bec68b3943f928ee7ad6d9afffd577a1663502e45e936b7f30f16
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be junk data, but the presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/strik?utm_term=weber+spirit+ii+e-210+grate+dimensions PDF link annotation
    • https://gilurabad.weebly.com/uploads/1/3/0/7/130775641/wezoxilewowifik.pdfIn PDF document text
    • https://pazonijozofax.weebly.com/uploads/1/3/1/6/131606668/4585795.pdfIn PDF document text
    • https://bulipabuwalo.weebly.com/uploads/1/3/4/1/134131868/nuditonejadugebe.pdfIn PDF document text
    • http://laxofetiduwi.iblogger.org/will_samsung_smart_tv_have_disney_plus.pdfIn PDF document text
    • http://tryplafond.xyz/75892986981omvz1.pdfIn PDF document text
    • http://duzegotola.medianewsonline.com/bugewukowogilikeb.pdfIn PDF document text
    • https://wapixetisabin.weebly.com/uploads/1/3/4/6/134685373/8360723.pdfIn PDF document text
    • http://kmplitka.shop/36560757074f4z4g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453333/normal_5fde8463d58cc.pdfIn PDF document text
    • http://boevoenlp.com/bifebepemujodarxsus.pdfIn PDF document text
    • http://zilamuro.medianewsonline.com/biomaterials_a_basic_introduction_chen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5fdc238c37d4b.pdfIn PDF document text
    • https://fewidatemuvej.weebly.com/uploads/1/3/4/2/134266352/goweluxibefilo.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/18977997001.pdfIn PDF document text
    • http://legalvictory.group/knife_spine_etchingvi0rd.pdfIn PDF document text
    • http://yesstore.pro/australian_apec_card_application_form54mlu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bituwevemexeku.rf.gd/how_do_humans_adapt_to_the_environment_in_mexico.pdfIn PDF document text
    • http://nafakosoleg.epizy.com/78647005499.pdfIn PDF document text
    • http://fugexumelelada.rf.gd/giwiborexez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de11577c-7292-4821-bd0a-2db770bdc9c3/how_do_you_respond_to_a_thank_you_email_for_a_job_application.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/sesogeviwoxaxusabetomiseb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33368cf5-c2e1-46d4-8454-89406491d314/lifuvafadije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf33de4c-206f-4082-9aef-3eaaaa4fd2e1/what_are_the_conventions_of_comedy_and_tragedy_plays.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/scrabble_two_letter_words.pdfIn PDF document text
    • http://litipodetipuwi.epizy.com/vb._net_tutorialspoint.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_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 5760 bytes
SHA-256: cf1ac5753685c9730e9d447115b1d7ebfc0e3dcfbac725b167436c60f4f53a3a
font_01_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 10424 bytes
SHA-256: 2c6e93310d7f083886ad6a34ed95864e7ab417f8540c3a9e261eeab503020663
font_02_sfnt_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 16144 bytes
SHA-256: e57c23d27cee5e1b0a68f7dc3700c87a63d812e908f3e2d8a49c2f8ad80d8add