Malicious PDF — malware analysis report

Static analysis result for SHA-256 2399b7c10a954384…

MALICIOUS

PDF

66.6 KB Created: 2021-04-04 03:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44afacd20657f990d6636f2b9ec76b96 SHA-1: 76bd8bd0b13be6727d09c14b9ab76e645ff177c5 SHA-256: 2399b7c10a954384abcb314b835c4ae3879d39070e844357fe259a78f76bd4f5
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, with the primary one being 'https://lozipotod.ru/award?keyword=1cm+squared+paper+pdf', suggesting a lure to a malicious site. The PDF structure also indicates it's part of a link farm hosted on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://lozipotod.ru/award?keyword=1cm+squared+paper+pdf
    • http://lebizifijafaxim.medianewsonline.com/megalavunobalo.pdf
    • http://nout-sale.site/el_seor_de_las_moscas_libro_paginasikswp.pdf
    • https://cdn.sqhk.co/pefevepufi/dgTEdgO/78353458604.pdf
    • http://pollsexpert.com/dewoborududanizyz.pdf
    • http://xakidofe.sportsontheweb.net/automobile_new_technology.pdf
    • http://zexejodubaxiku.mygamesonline.org/fugak.pdf
    • http://nexipufogavajid.getenjoyment.net/25220472479.pdf
    • https://cdn.sqhk.co/bomumuxa/eJhfR4m/71042824494.pdf
    • https://cdn.sqhk.co/nupopobax/KihicID/18483509479.pdf
    • https://cdn.sqhk.co/jisogixij/TrZ42jd/fovopinebejodivatinat.pdf
    • http://wulixiv.sportsontheweb.net/us_history_textbook.pdf
    • http://xalowazejadiv.getenjoyment.net/fafetidi.pdf
    • http://insurancecarusa.com/asp.net_mvc_tutorial_202056vq6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_99c1d85d6e144972ae779ed2ccda938c.pdf?index=true
    • http://zagofij.onlinewebshop.net/38049675800.pdf
    • http://tebaputazaxuva.myartsonline.com/7504907594.pdf
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_c062e65b01cc4531ade898ab9269975f.pdf?index=true
    • https://s3.amazonaws.com/viboxikuz/coc_offline_mod_apk_latest_version.pdf
    • https://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_19979c9b9b5649fcbdfe5730a5b612ba.pdf?index=true
    • https://s3.amazonaws.com/juvetaso/viboregiwulosotejum.pdf
    • https://s3.amazonaws.com/lopeteb/71713901426.pdf
    • https://dd91dc4b-d2fe-4aab-ab17-22023aa64d5b.filesusr.com/ugd/f05b1d_0ca975aef9d24d31b536c9c14a8d0d91.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceb4.bin
9391e281f41ead69693c3e7d7f6405d0a079b539a538941f87a57dba6925225f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB4 5352 bytes
font_01_sfnt_off0000e0d5.bin
6d4cfc88faa4618cd517463fc8631900131e79e4823d9c858394be3f0604313e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 10616 bytes

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