Malicious PDF — malware analysis report

Static analysis result for SHA-256 854cca0f520a52f0…

MALICIOUS

PDF

79.3 KB Created: 2021-03-28 15:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf0c3e26a40e0d7e71b71ea0a7ff9caa SHA-1: 91eb1ae95f2540183e8e144d5b42920224e179bd SHA-256: 854cca0f520a52f05e635afb0a95e88804d71162b268cd917cf89fc8416430e9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic to direct users to potentially harmful websites. The primary malicious URL identified is https://golowaki.ru/wix?keyword=ap+bio+electrophoresis+lab+answers, which is likely used to deliver a secondary payload or phish for credentials.

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-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://golowaki.ru/wix?keyword=ap+bio+electrophoresis+lab+answers
    • http://lnstagrambusiness.com/bourjois_healthy_mix_foundation_colour_match5ev3z.pdf
    • http://lnstagramcentre.net/27843929287khfhp.pdf
    • http://jugatilewe.22web.org/8972899168.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b75f8fcf-fbbb-4605-a7d3-be5ec3ff7c63/yard_machines_lawn_mower_repair_near_me.pdf
    • http://ralununajopupe.epizy.com/what_are_the_characteristics_of_bonds_as_financial_assets.pdf
    • https://uploads.strikinglycdn.com/files/c9a816bf-ea9f-4d04-9d80-bd3b822b8295/midland_x_talker_t75a_manual.pdf
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_0b544bcd3312426ebf0017d209d2bf65.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92127570-008f-4d23-89e0-c3c4b1fef74f/kivisefonamawobo.pdf
    • https://uploads.strikinglycdn.com/files/61517d5b-3e09-4e59-b049-e3eb3753c53c/87586462295.pdf
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_ad482886e4bf4fd0bf964e1c42933429.pdf?index=true
    • http://xelidamos.epizy.com/beach_buggy_blitz_apk_unlimited_money.pdf
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_c2e76d3688984fbd901e865852d9ada8.pdf?index=true
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_53052ec04f1b440e9c5f9ac909910ac7.pdf?index=true
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_fca72cb6b8f24cf89c12706ef589fe53.pdf?index=true
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_77a0e7ef520f4ed5bcf08d8d23ee33c1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7eaeb1f8-668c-4d86-b661-3c6ec90479b0/python_for_data_science_and_machine_learning_bootcamp_freecoursesite.pdf
    • https://uploads.strikinglycdn.com/files/a1b1fdb3-9e79-4674-9d55-5cdaf838c557/20834391343.pdf
    • https://uploads.strikinglycdn.com/files/64fe5a15-7808-49fc-a2e8-5b9a0723cda9/setavavinoledaxux.pdf
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_e616ebf1ec3e44b3a679ba40697476de.pdf?index=true
    • http://kimirukuku.epizy.com/duvusuvimawubexed.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_off0000eaa6.bin
ce721b10191ac793c6e4b122ad9f170aa6ec43439c0943fa827524d66887100e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 5028 bytes
font_01_sfnt_off0000fba6.bin
386e6b3b7347bf4d4d1497c626fa86f0c2ec14d11b5f43512d7b9dd93650fe6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 11256 bytes
font_02_sfnt_off00012208.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 4324 bytes

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