Malicious PDF — malware analysis report

Static analysis result for SHA-256 db79dabace226fa5…

MALICIOUS

PDF

77.1 KB Created: 2021-02-28 15:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a8eda123c00441daa1c0f1577607962b SHA-1: 8eaa112b3bc319adde408ec545d6a4a5c7e90ec6 SHA-256: db79dabace226fa56fc83f92e045bfde32816994e663abb910fb31af17cca045
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/123?utm_term=construction+safety+topics+2018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375908/normal_60064fcd42a08.pdfIn PDF document text
    • http://pukazabix.22web.org/icloud_photos_to_windows_pc.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/how_to_turn_off_closed_caption_on_sanyo_tv_without_remote.pdfIn PDF document text
    • http://mexuloxuxinona.iblogger.org/wordscapes_answers_level_8038.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/1387089.pdfIn PDF document text
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/2972448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_6011984e50fb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450732/normal_5fed80d179633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479213/normal_600662e7e600a.pdfIn PDF document text
    • https://pedogore.weebly.com/uploads/1/3/2/8/132815008/4149762.pdfIn PDF document text
    • https://bejobaxugifupe.weebly.com/uploads/1/3/4/6/134628864/xafuxetuja_kekafo_joruluwurileze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwemasux.myartsonline.com/does_sat_physics_have_formula_sheet.pdfIn PDF document text
    • http://galapor.rf.gd/sijimipamaduxeja.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/toyota_avalon_2015_user_manual.pdfIn PDF document text
    • http://fupuzujovo.epizy.com/wallpaper_hd_free_for_computer.pdfIn PDF document text
    • http://dololesorut.epizy.com/fusufokarojamomuf.pdfIn PDF document text
    • http://bubezowi.epizy.com/life_history_book_template.pdfIn PDF document text
    • http://ronogaso.rf.gd/infomercial_meme_template.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_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 5504 bytes
SHA-256: 7a8635944bfe14173fa8dde3ed2a74768a76afbaea825992c8b87dbd8f49a5a3
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 10728 bytes
SHA-256: 1629ce36e1189c9043dfd6e77334006ccefe92433d5c1afbda7e363cf2d407fd