Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d46d3228cc96f87…

MALICIOUS

PDF

76.7 KB Created: 2021-02-25 03:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2c6cfa15f979a270444eead600492463 SHA-1: 4ddceccb6b9e204c9280ab3a10649dd1e898cd6c SHA-256: 3d46d3228cc96f8742cb091c7427a670144d8380c06ef64a775f8eaa59d9064c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=plantronics+model+m70+pairing PDF link annotation
    • http://sks-expertiza.ru/beduvonumafexiscn1yz.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/how_to_put_jlab_in_pairing_mode.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/how_to_work_out_time_taken_in_physics.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/kepefomewoniwizovetulif.pdfIn PDF document text
    • http://upgrade4me.com/cpr_guideline_20186ty6p.pdfIn PDF document text
    • http://roman-holidays.shop/59293391280x45nf.pdfIn PDF document text
    • http://hhizmet.com/jatopunediziph0hzx.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/ipega_controller_android_app.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/casio_g-shock_atomic_solar_gps_watches.pdfIn PDF document text
    • http://deutschebank-meine.com/gerabefuypa4i.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/78796331269.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/47410312739.pdfIn PDF document text
    • http://fobuzepiru.epizy.com/what_are_the_6_types_of_infectious_agents.pdfIn PDF document text
    • http://balopatesegefa.rf.gd/firefox_browser_apk_uptodown.pdfIn PDF document text
    • http://jaziwovapotulit.epizy.com/timaxanarisijusod.pdfIn PDF document text
    • http://dufijofitaj.epizy.com/23964986742.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 5404 bytes
SHA-256: 1ce03caffc1d4b28f5b8ad69cf804024c0ece3a47526a10d60cbb860aae5eaad
font_01_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 10552 bytes
SHA-256: facfd71a0e81c4176501d0301e535a4a7b09ac0a7bc3e2e9293d2502743a3072
font_02_sfnt_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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