Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb78799cb806e26d…

MALICIOUS

PDF

74.2 KB Created: 2021-03-17 08:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01cf7ea43b23e5d9033e9a6c4ced7819 SHA-1: d234ab268a450894f728068146b64b6b6f9611c7 SHA-256: bb78799cb806e26d2fc0a724da081a59fd9435781e7bbfd3985bd853dc5d56ac
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm for traffic manipulation or phishing. One of the extracted URLs, 'https://xezojetit.ru/123?utm_term=eminem+stan+instrumental+with+hook', is flagged as unknown and is likely malicious. The ClamAV detection and ML classifier further support the malicious nature of this PDF, which is likely used as a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=eminem+stan+instrumental+with+hook
    • https://wiromokuxuzub.weebly.com/uploads/1/3/5/2/135298753/5363533.pdf
    • http://gavojutopubiri.getenjoyment.net/76692422775.pdf
    • https://toviwapomini.weebly.com/uploads/1/3/4/7/134727984/wodewajig.pdf
    • https://cdn.sqhk.co/zifiguwosu/gdghrhd/subterfuge_definition_francais.pdf
    • http://lezigovedavide.getenjoyment.net/tinatizuwaduripagejala.pdf
    • https://cdn.sqhk.co/tejilunuf/TRhhn7j/dsi_2018_formulaire_remplissable.pdf
    • http://xadixul.66ghz.com/dazerose.pdf
    • https://damupese.weebly.com/uploads/1/3/4/4/134492451/xidowawupijopokug.pdf
    • https://tolixolosunep.weebly.com/uploads/1/3/4/4/134403343/gabuzam.pdf
    • https://cdn.sqhk.co/zevijevam/gdhi2PS/timosem.pdf
    • http://bukogibewidigu.iblogger.org/mubekomo.pdf
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/789d3ba8e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vikukinumet/march_of_empires_war_of_lords_guide.pdf
    • https://s3.amazonaws.com/gofilafixu/rutefubuvabukawukide.pdf
    • http://baxewape.myartsonline.com/how_to_clean_a_ruger_lc9s_pro.pdf
    • https://s3.amazonaws.com/xukanomarexumu/31726918428.pdf
    • https://s3.amazonaws.com/befafuni/13339913142.pdf
    • http://xakagigoneliv.myartsonline.com/integrate_cos_x2.pdf
    • https://s3.amazonaws.com/gusule/what_is_a_living_unit_fha.pdf
    • https://s3.amazonaws.com/ratixifo/driver_booster_6._3_serial.pdf
    • https://s3.amazonaws.com/sorogamat/what_do_you_feed_daphnia_culture.pdf
    • http://nudagimanefej.atwebpages.com/rodgers_and_hammersteins_cinderella_songs_1997.pdf
    • https://s3.amazonaws.com/zesixefe/begogezepewetezawoju.pdf
    • https://s3.amazonaws.com/vexeliku/carolus_tools.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_off0000e58b.bin
a9ed731ff3541946a4f510aa06339fb8c1c834a34408fc2b1484da34aaa468a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 5040 bytes
font_01_sfnt_off0000f691.bin
0a1a8f7eddd4f6a441b68df28532aa8278dc33d1018160b1c9a1ed1e13b6e902		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 10656 bytes

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