Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2816e6936da7d34…

MALICIOUS

PDF

69.6 KB Created: 2021-04-01 02:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fe5ad255ae64c5930a544436bd624305 SHA-1: 65ea1cee4b3478d1a4fd47bd692dae4dd5620991 SHA-256: b2816e6936da7d349cc290e5ffd9a0869c96994b079dc869b5249773ae6f2958
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content or phishing sites. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/award?keyword=autocad+to+pdf+converter+online+coolutils PDF link annotation
    • https://cdn.sqhk.co/wogigixa/STXRvhd/sani_cloth_hb_sds.pdfIn PDF document text
    • https://ritajixudigozik.weebly.com/uploads/1/3/5/3/135345652/3418323a3.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/lgTkOo3/dota_chess_strategy_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/f1Em08B/48935837401.pdfIn PDF document text
    • https://lumuvimusu.weebly.com/uploads/1/3/4/7/134719948/2383284.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/dib1LPL/how_to_get_a_girlfriend_at_age_11.pdfIn PDF document text
    • http://baxemoge.iblogger.org/greedy_cave_newbie_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_c86063b09b5c4dcb80f8fe3732226a31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/ropixafudixejosatav.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/what_is_theme_of_beowulf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab61677b-e1f4-415d-94b3-ec0144e6e624/xejuvizigodukunidef.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_faab61f968d149faa28aad0b4cc89f8f.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_eefc2ee93c2b4b198e4f114b96870548.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/tattoo_artist_of_auschwitz_characters.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_adad18ca130344eaa24f9b664bedfa62.pdf?index=trueIn PDF document text
    • http://dagasadat.epizy.com/algebra_1_textbook_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2aeea0-02df-477e-973f-7a4d799c13de/skywalker_15_round_trampoline_pad.pdfIn PDF document text
    • http://puxedasepuk.epizy.com/16147383330.pdfIn PDF document text
    • http://tomogutirop.rf.gd/barriers_of_effective_business_communication.pdfIn PDF document text
    • http://nebejobibaveb.epizy.com/cotton_cartoon_bed_sheets_online.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 5196 bytes
SHA-256: c572786b499cf2208e0d7226f7171be2d70293e4dae1e4af380c8c87dfcdb4f7
font_01_sfnt_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 10364 bytes
SHA-256: 711a732acf041a85af79d7456d36ea8b6c74bda0cf611cebc3e214311bf13f2f