Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2716750763dc804…

MALICIOUS

PDF

77.8 KB Created: 2021-04-01 14:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c8e3cfa80b8908b65f32a18dd866d5fd SHA-1: 8914aabafad920ecbcc32a8e1b94d31f0c991bb3 SHA-256: c2716750763dc80485a71cb3a0e31472a2b17bee063e7638542d12d3dd7e7661
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute malware or phishing content. The document's structure and numerous external links are consistent with a malicious PDF designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/award?keyword=glencoe+algebra+1+textbook+pdf+download PDF link annotation
    • http://ita-fitness.fun/business_english_for_beginners_worksheetsx9fef.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/nGjdgiO/strikers_1945_mod_apk_free_download.pdfIn PDF document text
    • http://uspeh.icu/dosatukijumidamadovakiqoovl.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/QwhcmCg/1341089352.pdfIn PDF document text
    • http://ryukzak.digital/sabertooth_z77_biosevs5x.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/4c0Hghy/words_and_pics_answers_level_pack_6.pdfIn PDF document text
    • http://goldotzyv.ru/why_would_my_kindle_not_turn_onhpyjm.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/ZxwjdGm/kijowolidufibipevago.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/jcHhbL8/fantasy_ice_cream_factory_tour.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/xrEJaid/squad_free_fire_survival_battleground_mod_apk.pdfIn PDF document text
    • http://nekemepomisares.22web.org/kigewigisada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_2fed4f75b61e47dc8d25867f977580df.pdf?index=trueIn PDF document text
    • http://lukutejotavu.epizy.com/journey_to_the_west_the_demons_strike_back_online_watch.pdfIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_04b29e048bbe4b2a885a97854682467c.pdf?index=trueIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_efee548e381644e1a7328120d039a215.pdf?index=trueIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_3371af8e7b884935ae750049003caf31.pdf?index=trueIn PDF document text
    • http://busixojap.epizy.com/tibuki.pdfIn PDF document text
    • http://nosodete.epizy.com/business_english_in_use.pdfIn PDF document text
    • https://9169454a-6e45-4b39-89c4-5cd9bf0a6084.filesusr.com/ugd/32fbc8_716d4bb38893414dbed35523fe71d88b.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_b5e226f812964215a4ebbff65f023a10.pdf?index=trueIn 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_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 5592 bytes
SHA-256: 64843be467f7e16e7ff01b4034b8ac7ccbf24a7ad011e940ca51f8ce06bd0e1e
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 11404 bytes
SHA-256: acfa9e1d1ac7e6f960a2f166879d218385c6fac7c2f81ada8a06e76102b57d00