Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68ec268d219a10e…

MALICIOUS

PDF

118.5 KB Created: 2021-03-20 19:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efad6aeca12eea67e65b7bc0ed40461b SHA-1: 98b1ac8fa209d90e14ef5c15f3145baf4bb27cdc SHA-256: d68ec268d219a10e5edda07c8768bd018258951198c70dcf1b7e266d8c4ac7ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning attempt. The document body, though heavily obfuscated, appears to be related to test answers, a common lure for phishing or malware distribution. The presence of embedded URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=chapter+3+exponential+and+logarithmic+functions+practice+test+answers
    • https://cdn.sqhk.co/luwibajik/eClXuKG/nfl_tv_schedule_today_2020.pdf
    • https://cdn.sqhk.co/suxujaba/9xkijhg/maxillary_lateral_incisor_root_formation.pdf
    • https://static.s123-cdn-static.com/uploads/4495392/normal_60012a9e691a0.pdf
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdf
    • https://cdn-cms.f-static.net/uploads/4450438/normal_6046a89ee1a4f.pdf
    • https://cdn.sqhk.co/libodinidep/lhbqge8/14137448461.pdf
    • https://static.s123-cdn-static.com/uploads/4466135/normal_5fc79c6ed1368.pdf
    • https://cdn-cms.f-static.net/uploads/4456398/normal_6049d4a903287.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/91675b3f-4244-4201-b155-510fd4c68d7c/what_is_the_song_id_for_older.pdf
    • https://uploads.strikinglycdn.com/files/61c69153-2846-4c58-8046-cbd9d17b7a01/how_to_change_pressure_on_fisher_paykel_icon_cpap.pdf
    • https://uploads.strikinglycdn.com/files/be4b3e80-22ea-41a2-b6f2-efc9e1b93b4b/graco_magnum_pro_x7_reviews.pdf
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_96d31fa2679b4b239d6ab0c2005a543d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a16ac14-f635-4904-bc69-6fe4fa637b39/what_order_are_the_ranks_in_the_army.pdf
    • https://uploads.strikinglycdn.com/files/87514413-622a-4c06-beb4-b47478cc5709/95750966848.pdf
    • http://jifobobaganut.epizy.com/contract_template_for_private_car_sale.pdf
    • http://deniketeza.rf.gd/54136294924.pdf
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_6b072a269cc64475b4796c5a3cac317f.pdf?index=true
    • http://javajese.epizy.com/52867283906.pdf
    • https://uploads.strikinglycdn.com/files/0ad96486-f9b9-4e32-aa2e-5f8554b42408/what_kind_of_jobs_can_you_get_with_a_health_administration_degree.pdf
    • https://uploads.strikinglycdn.com/files/df0b3836-f9bb-4b1b-a6a4-1df6c1d5525e/master_secret_of_the_ages_meaning_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/4cb51e8f-c172-4cee-95a6-452f2d7166d9/hoover_steamvac_spinscrub_not_suctioning.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a57.bin
767f17575864f1a0107f7c7f0271219adf76a69cd5fb09b1ffa3ff1ca1108497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A57 5796 bytes
font_01_sfnt_off00018e00.bin
a7fd7844f6b1d0a3548ba875300df659ebee28ca35d02de498dcb5c0f0dc7993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18E00 13560 bytes
font_02_sfnt_off0001bc00.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC00 4324 bytes

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