Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5278e32d34a52b8…

MALICIOUS

PDF

83.8 KB Created: 2021-05-13 12:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ece865efec688c01688a019acc0f7f49 SHA-1: 24d8b7d7828ee88d70df49a67e2655de7e85736b SHA-256: f5278e32d34a52b80e8e99457450b98882a4c964a2028317d685ccae70ae2981
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of a large number of external links, many pointing to disposable hosting or redirectors, indicates a link farm designed to direct users to potentially malicious sites. The document body contains garbled text, suggesting it is not intended for direct user consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://nipisod.ru/strik?utm_term=firefox+48.0.2+32+bit+download PDF link annotation
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/lipegagamefejurukuv.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/mSGPGFK/all_information_about_football.pdfIn PDF document text
    • http://masito.space/92997110268tbjxb.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/dujexoleko.pdfIn PDF document text
    • https://cdn.sqhk.co/novupezezis/C6eifja/wasiwirilesener.pdfIn PDF document text
    • http://lopitimew.mygamesonline.org/puferawatopefikilagipowa.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/hfohekw/soft_romantic_song_ringtone_free_download.pdfIn PDF document text
    • http://beststudent.fun/71706584004jihzr.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/gixhfnK/umc_hospital_el_paso_jobs.pdfIn PDF document text
    • https://morupataniseb.weebly.com/uploads/1/3/4/5/134502176/8cc85b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_6026856b6d892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_60319af93c36b.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/sijoboxebovabo.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/dlZtjc7/puvevolezuwinekolab.pdfIn PDF document text
    • http://pixxel.life/is_the_4.7_v8_magnum_a_good_enginefd46e.pdfIn PDF document text
    • http://shtancircul.site/electrical_apprentice_aptitude_testihc99.pdfIn PDF document text
    • http://metryck.info/92154647243t4wwp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sagoralezerelo.onlinewebshop.net/pifuzokesidupexuk.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/lifupiviwuwadijularobof.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/explain_the_biomedical_model_of_health.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 5520 bytes
SHA-256: fa464bd6d553b748c85e43a7530740a9a272f49aa7244f980d39982f32d6a96a
font_01_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 15148 bytes
SHA-256: a1a71cb1a588e1f60796ef99d99ec807409d7e4b88de632c810067d88f1c2da4
font_02_sfnt_off000131ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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