Malicious PDF — malware analysis report

Static analysis result for SHA-256 9919d8216255b060…

MALICIOUS

PDF

87.9 KB Created: 2021-03-16 06:34:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18ad80b1a6dcdd1a9702e236ae75e868 SHA-1: eca3b741f69fab8b43a77930a9fa537be3100187 SHA-256: 9919d8216255b0601eb928bfd903cc1220ddd721419ff9c0b445272dad69fbe3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious or unknown domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=cisco+ccie+routing+and+switching+study+guide+pdf
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/8398628.pdf
    • https://zebepinexorusog.weebly.com/uploads/1/3/2/6/132695607/vusegu.pdf
    • http://mowefopovog.mywebcommunity.org/briggs_and_stratton_500_series_158cc_carburetor_adjustment.pdf
    • https://vilinumatilaji.weebly.com/uploads/1/3/2/7/132740241/vuvenamip_fojewolisopini_vususe.pdf
    • http://rofibopuxi.iblogger.org/sub_zero_ice_maker_instructions.pdf
    • https://belujewirozem.weebly.com/uploads/1/3/2/6/132681559/356bdf5c8d9e.pdf
    • http://bipiraxas.iblogger.org/attendance_register_format_for_office_with_time.pdf
    • http://baluninelekab.22web.org/63626670255.pdf
    • https://koberowebajufom.weebly.com/uploads/1/3/4/0/134096943/0e3aa0f.pdf
    • https://nabisomo.weebly.com/uploads/1/3/5/9/135993280/kejitoxefi.pdf
    • http://vozobatenaw.mywebcommunity.org/16961854101.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvazi/kiwalisikuvukiruruwapa.pdf
    • http://bawanakoj.epizy.com/arm_microcontroller_lpc2148_datasheet.pdf
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_881f8b1882504e68bc827081e0b43e50.pdf?index=true
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_733da6ee06bd424dbe4ca70bdc678f60.pdf?index=true
    • https://s3.amazonaws.com/pubopelej/playable_races_warcraft_3.pdf
    • http://danebusuji.onlinewebshop.net/define_trop_medical.pdf
    • https://s3.amazonaws.com/werowibovezoje/wotlk_warlock_demonology_guide.pdf
    • https://s3.amazonaws.com/kasuwevovog/bloons_td_battles_6_pc.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_off00011766.bin
3f509c4960c09a4ed45f997a9d8e41bffca9b944f8c405520e0d1c19585c818e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 5484 bytes
font_01_sfnt_off00012a1e.bin
3dd09b074bbedf2bbde9b06e750f679cfca9747b89162de26b67bd2d3014de1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1E 11312 bytes

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