Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16febd59e2b4b8d…

MALICIOUS

PDF

71.9 KB Created: 2021-03-12 12:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85468c4b4a3d70e207db8bb915522505 SHA-1: 7217b09460f0da652de460541278c470ce67e94f SHA-256: f16febd59e2b4b8dab6faa58ec63a71459cbd23839e67362d47356d51097b9f1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=texto+doctrinas+filosoficas
    • http://bloodcraft.online/how_to_pronounce_navajo_dineiveb2.pdf
    • https://cdn-cms.f-static.net/uploads/4411921/normal_601b27967080a.pdf
    • https://cdn-cms.f-static.net/uploads/4448539/normal_602c37d10b8fd.pdf
    • http://topmassage.net/how_to_activate_flash_player_on_chromesn6yu.pdf
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/vemivowod.pdf
    • https://munefetuwavebif.weebly.com/uploads/1/3/2/6/132683017/005f0a35.pdf
    • https://nusuvonofa.weebly.com/uploads/1/3/1/8/131872273/kewifewadavo-buzazakelu-fipowuz-vejos.pdf
    • http://antonioita.fun/download_stickman_dismounting_mod_apk_revdlrd5tt.pdf
    • https://fugopezawisobib.weebly.com/uploads/1/3/1/3/131383650/3594428.pdf
    • https://tizusetupo.weebly.com/uploads/1/3/1/6/131607013/01faa210e79b163.pdf
    • https://timivoza.weebly.com/uploads/1/3/5/3/135315173/2402291.pdf
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/6235508.pdf
    • https://kolokizegilo.weebly.com/uploads/1/3/4/3/134370221/rafiminizipe-gategelotuva-kofujeboroj-libefajimikele.pdf
    • https://finukapaxareb.weebly.com/uploads/1/3/4/4/134494590/9685821.pdf
    • http://lnstagram-office.com/washington_dc_covid_19_testinge5k0x.pdf
    • https://vanazufir.weebly.com/uploads/1/3/2/7/132740694/7823924.pdf
    • https://gezedasi.weebly.com/uploads/1/3/1/3/131378850/d50a7.pdf
    • http://frontend-developer-azaynullin.site/how_much_oil_does_onan_4000_take3zxpt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bejeseja/emulator_games_pokemon.pdf
    • https://s3.amazonaws.com/bitizopovopaso/tujivugasanimafazu.pdf
    • https://s3.amazonaws.com/dazinibonofobi/optimate_4_guide.pdf
    • https://s3.amazonaws.com/widuxade/jesupigiwirirusedejuk.pdf
    • https://s3.amazonaws.com/senodiw/28443185993.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfde.bin
be68016e146bf2c6756aa2c851b41fab58652f1159ac37644c4639fccffbb14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 5032 bytes
font_01_sfnt_off0000e10c.bin
442c40b794ffacc46c1241ed49ad8d75e0dff9c29acec2f0a7b3bab32751b76e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 15600 bytes

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