Malicious PDF — malware analysis report

Static analysis result for SHA-256 08da3eaa8d4d8b37…

MALICIOUS

PDF

88.9 KB Created: 2021-03-16 19:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9759f0dc27c66dcf458c0a146391468 SHA-1: 75527b15996d867ee353e207e73b71a2631ad06e SHA-256: 08da3eaa8d4d8b37134f5d231efa3092641d248260e8c75a5bd5effce3ff0665
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be part of a link farm designed to improve search engine rankings for terms like 'algebraic expressions questions pdf'. This suggests a phishing or malware distribution attempt, likely leveraging SEO techniques to attract victims. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the presence of many external links indicates a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/award?keyword=algebraic+expressions+questions+pdf
    • https://cdn.sqhk.co/jotepomi/fpsKGoe/29709920547.pdf
    • http://tipaxoj.66ghz.com/nizadisumu.pdf
    • https://cdn.sqhk.co/potebuso/HBegiic/crosswords_with_friends_cheats_10_16_20.pdf
    • https://cdn.sqhk.co/pigajifaw/auy11gc/6175695468.pdf
    • https://cdn.sqhk.co/ripalufix/gesBJ99/73825994429.pdf
    • https://cdn.sqhk.co/rosafipex/uh7gdbx/fox_world_news_live.pdf
    • http://wusozupu.mypressonline.com/keto_diet_vegetarian_meal_plan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wujodibu/que_dia_son_feriados_en_noviembre_2020.pdf
    • http://dopovis.myartsonline.com/los_tipos_de_textos_mapa_conceptual.pdf
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_910bc1da83694ddeb946a91e746f8bb8.pdf?index=true
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_b64126f76d534d14ae1564c9fafe9d84.pdf?index=true
    • https://s3.amazonaws.com/wovedukevikov/canon_digital_photo_professional_4._6_manual.pdf
    • https://s3.amazonaws.com/gavobawum/kelvinator_la_cuisine_oven_manual.pdf
    • https://s3.amazonaws.com/nafamaragisek/duzonexudexovupulotasuz.pdf
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_40b03400e2b44608be476681704ac940.pdf?index=true
    • http://pugonekiwijotom.rf.gd/jurnal_budaya_bali.pdf
    • https://s3.amazonaws.com/vokeri/gunaw.pdf
    • https://s3.amazonaws.com/regegozumekoza/demography_journal_submission_guidelines.pdf
    • https://s3.amazonaws.com/fosalizuzu/69489457829.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/android_studio_installation_linux.pdf
    • http://fimaxopazeviv.rf.gd/news_reporter_journalist_job_description.pdf
    • https://s3.amazonaws.com/farezelof/bleacher_report_instagram_football.pdf
    • https://s3.amazonaws.com/bibejovixapis/29289764605.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_off00011ae5.bin
56e27a5614cf4c700bbf94f4d931bbba15a8f5899673f679b33347aeb4cb7b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 5648 bytes
font_01_sfnt_off00012e24.bin
51a43378630f8105bdc97342884f4bb798339f53120ecc1add7f71db8c2f3323		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E24 12292 bytes

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