Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec83e2264ba049c7…

MALICIOUS

PDF

79.4 KB Created: 2021-03-30 00:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f494ce44fe2e26bf49a002d3c878bc7c SHA-1: 5717db50f3afc81e258b1840ccfbec0908973a42 SHA-256: ec83e2264ba049c71a0453838a6e2fa2feaa7bfc58b04c55cef97d613cf2d7cf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=hec-hms+manual+em+portugues PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491432/normal_602f7097beffc.pdfIn PDF document text
    • http://pifafixejizigu.scienceontheweb.net/inductive_and_deductive_approach_in_teaching_grammar.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/JFngiSH/pizasikapip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500897/normal_600abb3c64329.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/chfaibt/hammerite_metal_boya_renkleri.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/ziloza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416140/normal_600263ccf1fe8.pdfIn PDF document text
    • https://cdn.sqhk.co/xawowaguka/Xjgifhi/bhole_baba_all_dj_song.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/66846970595.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/bewejobogaxogukaganavutat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_5fcdfd59dd536.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/aAJjb2N/vawedoponebigufidipifom.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/lamexazezozeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_601029bdb75b2.pdfIn PDF document text
    • http://funasowuto.getenjoyment.net/wivekuse.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/99693905690.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/jurizemiku.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/sharad_upadhye_books_marathi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tunifowu.epizy.com/nubugakaduvaw.pdfIn PDF document text
    • http://gotupodejepu.rf.gd/tv_ears_replacement_headset.pdfIn PDF document text
    • http://gewuvuvemaguda.rf.gd/56749529601.pdfIn PDF document text
    • http://godusisoti.onlinewebshop.net/ionesco_la_cantatrice_calva.pdfIn PDF document text
    • http://piwolimosopobu.myartsonline.com/the_art_of_war_in_telugu.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_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 5340 bytes
SHA-256: 15670bfb523d3d73fde3d7c0ec8eceb4264249b273560ed9f944d9d4a2456a39
font_01_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 12636 bytes
SHA-256: c35615319b79b179c99feb2de73fa669e2f155b361e66ea40521db6f5b98d71d
font_02_sfnt_off000118ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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