Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63c3d2b316d2cf8…

MALICIOUS

PDF

72.3 KB Created: 2021-04-05 02:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4d2a7140705401644907332c8dbe4c3b SHA-1: 6cdc8dc72b3ed917d36acc9d26858635ae3b24b1 SHA-256: e63c3d2b316d2cf8d6ffec60563abfe38ec958666ae5aca332d3932bee12a68f
186 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 hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to suspicious domains, and the document body, though corrupted, suggests a lure related to 'math rules book pdf'. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://lozipotod.ru/123?utm_term=math+rules+book+pdf PDF link annotation
    • http://creamwalls.space/oracle_11g_sqlplus_client_download4evsl.pdfIn PDF document text
    • http://qlemelest.online/pumibakipakuzanasupazose3nznw.pdfIn PDF document text
    • https://saworajopasu.weebly.com/uploads/1/3/0/7/130775294/920703.pdfIn PDF document text
    • https://nogudoge.weebly.com/uploads/1/3/4/0/134017621/revukudeza.pdfIn PDF document text
    • https://fikenetefi.weebly.com/uploads/1/3/4/7/134771518/2f043c8313f52b6.pdfIn PDF document text
    • https://kevafesituwa.weebly.com/uploads/1/3/4/0/134040773/tuwazeteke-sobesijixisus.pdfIn PDF document text
    • http://zespodsvetkoy.site/john_deere_js40_owners_manuala5mlj.pdfIn PDF document text
    • https://nuguzawopaji.weebly.com/uploads/1/3/4/0/134040365/d3ba8d0.pdfIn PDF document text
    • http://kpupnov.pro/51713725002x8fxu.pdfIn PDF document text
    • http://digtalcaliper09.xyz/10077003374v1i8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f2732c0-c6eb-401d-a32d-e79782c50c27/82395789260.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/super_teacher_worksheets_first_grade_spelling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca553b6-d137-47f6-82cb-c4a96764f3b2/aldo_leopold_sand_county_almanac_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/manorama_max_for_android_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be678041-4087-44e8-bcf9-1b5147784401/troy_bilt_mustang_xp_50_review.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/five_nights_at_freddys_3_play_free_online_games.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/garmin_gpsmap_64_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed50eb48-2449-4aa8-aa10-5d34b78f0405/lee_strobel_books.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/93210986094.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/berenstain_bears_christmas_tree_dvd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc851e0a-749b-4beb-8a82-32ebb3537f11/xivoposux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e79eb169-a249-4b30-875f-cfd35bcb5ff5/kojutidedakozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4968fd56-a744-4728-9e5c-5f6668ba8749/whats_riba_in_islam.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/gokizewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a573472b-90b6-48ee-aeb4-a0f517f5e574/xixadolaravivazebef.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/free_printable_3d_christmas_decoupage_sheets.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_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 5340 bytes
SHA-256: 925cff77e597466fc96cd59636f662458274e38cbf6474c9462dceb9637fb837
font_01_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 10780 bytes
SHA-256: 68d2179c63ab8ee2c70ec8387d8f79909df724b1b983cf187de8c9477f9936a4

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