Malicious PDF — malware analysis report

Static analysis result for SHA-256 7732ccd53e6ffbd9…

MALICIOUS

PDF

98.8 KB Created: 2021-05-15 07:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 79fba4356ba4eae8b6fba616cac59f5c SHA-1: b89f20dd422500c8f7d22f14cae3545ac08f31b5 SHA-256: 7732ccd53e6ffbd9dd07f0bef9e8df3814106c68f2a8f894d5f5d4d282db8ec4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains a search query related to COVID-19 treatments, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=which+medicine+is+used+for+covid+19+in+kerala PDF link annotation
    • http://molotkov.site/what_kind_of_sim_card_does_ps_vita_user650m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410989/normal_5fc6fe3cbb7f6.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/wonuzajetixufi.pdfIn PDF document text
    • http://gosezan.22web.org/sonamufulawomezadinu.pdfIn PDF document text
    • http://sparzha.club/jeviwokidf54r.pdfIn PDF document text
    • http://smeh-mif.space/luvumov9juc5.pdfIn PDF document text
    • http://baugroup.info/5651459998600105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_6034eb15b89ba.pdfIn PDF document text
    • http://baxagaxisatipa.22web.org/78482491051.pdfIn PDF document text
    • http://findssldz.xyz/52442273835swboe.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/telemecanique_altivar_31_manual_espaol.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/10929206511.pdfIn PDF document text
    • http://zurujavurobe.scienceontheweb.net/international_sports_awards_2020.pdfIn PDF document text
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/pijuzuz_mugazexupuxoseg_mobudokiv_xivemusoka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_e33df5dd79d44fd5a4b190d0d82c9f30.pdf?index=trueIn PDF document text
    • https://dd54f144-242a-4a88-9385-6c39f9996aab.filesusr.com/ugd/9f32c1_870a2df79a1f41e982fc42a0de9c3754.pdf?index=trueIn PDF document text
    • http://mivenivanuzepa.epizy.com/back_ups_xs_1300_manual.pdfIn PDF document text
    • http://zotuzibufuvonif.rf.gd/fidokuvanemaxof.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_53aa2aa331484affbb757f8a8004538f.pdf?index=trueIn PDF document text
    • http://zetenemamowuliz.epizy.com/ziviwezamutovomefapefiza.pdfIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_a48d2d6739284dd3a055165381b020ed.pdf?index=trueIn PDF document text
    • http://suwuriru.onlinewebshop.net/cheats_for_blood_bowl_2.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_off0001440e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440E 5604 bytes
SHA-256: 19aaaeb25d923dd54b6e0d5e4c98fc964dd9bdf55b79dfb4dbc28983c1a7afd1
font_01_sfnt_off0001570a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570A 11280 bytes
SHA-256: af080056a3f51b076d8247d6c1a029268d0c7204e5dfb74327258482ef5b04ee

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