Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b2e2f99152779d…

MALICIOUS

PDF

71.1 KB Created: 2021-04-03 11:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f1fb5b3574a635035b9810eff7dbb5c8 SHA-1: 56d928ced9980f60d2b1ae5cb95d470dcd9bed34 SHA-256: 45b2e2f99152779d41876e110878470d9db625799250039e1f08a4f3d37f51ad
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 0.9997

Heuristics 5

  • 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 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://leonvi.ru/award?keyword=business+plan+for+small+hotel+pdf PDF link annotation
    • http://duzegotola.medianewsonline.com/abelmoschus_esculentus_l._moench.pdfIn PDF document text
    • https://fuvejewitopi.weebly.com/uploads/1/3/1/0/131070508/a50151aaf.pdfIn PDF document text
    • https://cdn.sqhk.co/subesanodag/HgilUlY/chemistry_book_online_answers.pdfIn PDF document text
    • https://xanavixigusom.weebly.com/uploads/1/3/1/4/131453194/kakez-temotab.pdfIn PDF document text
    • https://cdn.sqhk.co/nivazesoj/IUhjWic/boost_likes_instagram_app.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/5zh2cee/galaxy_empire_gameplay.pdfIn PDF document text
    • https://tupusedaluniji.weebly.com/uploads/1/3/0/7/130738871/9767559.pdfIn PDF document text
    • https://figinuvoniz.weebly.com/uploads/1/3/4/6/134654755/lufarobeb_didute_sozodaxefe_fexitu.pdfIn PDF document text
    • http://pebonemariv.mypressonline.com/xewedasesegu.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/93153958314.pdfIn PDF document text
    • http://hq-cleartv.info/how_to_day_trade_stocke8vti.pdfIn PDF document text
    • http://moneyindia.site/xivodorozokuwevyd70.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/jhUtPgk/ielts_speaking_part_1_answer_length.pdfIn PDF document text
    • http://moradudipomibo.mypressonline.com/giger.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/37926235143.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/78157055127.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/flower_that_meanings_happy_ending.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/honeyguide_bird_information.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/65482969952.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/proper_deadlift_form_sumo.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/purpose_driven_life_quotes.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_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 5328 bytes
SHA-256: 56002ccd1dfc9e01a1a31dfa0c5a7fb0464a57d705b068f04c6c255ebd379c15
font_01_sfnt_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 10776 bytes
SHA-256: 694e47b69187a1d54531abdae1f76cf53999272ba27617a2bf8de0bcaab765d5

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