Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcc497dd1e59714…

MALICIOUS

PDF

76.3 KB Created: 2021-02-14 19:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: fd8fba27d1a78fa03d96768242a05b05 SHA-1: f86577821b83d439b8f078f75b9b165dd490019f SHA-256: 5bcc497dd1e5971470c41ad122f0afdfbb199114d80994b13308335a647a57ba
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and Weebly hosting, indicative of a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution, disguised as a free download for a financial book. No scripts were extracted, but the extensive link farm and high detection scores point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/wix?keyword=robert+kiyosaki+second+chance+pdf+free+download PDF link annotation
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/lojavedonutosu.pdfIn PDF document text
    • https://galekogikelubem.weebly.com/uploads/1/3/1/4/131438025/gedamaruvurovebevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5fdf2b31b39c2.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/gfijhcf/watch_youtube_with_friends_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5ff2e065183d9.pdfIn PDF document text
    • https://cdn.sqhk.co/doxelatofon/djgKhiw/color_changer_pro_no_root.pdfIn PDF document text
    • http://fenotowibezusen.iblogger.org/72076838927.pdfIn PDF document text
    • https://cdn.sqhk.co/fagisuxupinu/gdUUhhb/wanibaronul.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/gf3bhjY/vegan_gluten_free_pumpkin_dessert_recipes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404512/normal_60095cc2da2d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufarudewigufeb.rf.gd/crsu_date_sheet_2018_3rd_sem.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/word_search_puzzle_157_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/attarintiki_daredi_songs_com_free.pdfIn PDF document text
    • http://bopexetosezulav.rf.gd/agriculture_sector_in_malaysia.pdfIn PDF document text
    • http://wumuduwowuwi.rf.gd/aeneid_book_6.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/hollywood_audio_songs_free_sites.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_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 5648 bytes
SHA-256: 728a75ad975b7e0780da476c971034657b63990d1d56a222c5f6b4b6b51cd60e
font_01_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 10712 bytes
SHA-256: 598246fb062656413ce14fb411662952b7a6a95138d278e4a47ce5be94f6ae42

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