Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86119b5f140f80b…

MALICIOUS

PDF

79.5 KB Created: 2021-04-02 18:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 29d9c37fd3e85b952711dc0f592ae1ed SHA-1: 2f709d2f8e74b0ff66f7f53710617ec035f5df6e SHA-256: f86119b5f140f80b755ec25315f81adc9ce37aa696fd7eb1c1e9f877b7e499ed
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/award?keyword=epidemiology+of+ascaris+lumbricoides+pdf PDF link annotation
    • http://wonder-ita.space/the_transgender_studies_readeri8mrj.pdfIn PDF document text
    • http://repaircreditscore.info/how_to_fix_a_diesel_engine_with_gas_in_it1fukw.pdfIn PDF document text
    • http://tinubawolu.mywebcommunity.org/tonitafososavibomebemena.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/amparo_davila_el_huesped.pdfIn PDF document text
    • http://creamwalls.space/south_film_linkbnk9c.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/cb19b0ed.pdfIn PDF document text
    • https://vigoruso.weebly.com/uploads/1/3/4/1/134131386/7a422.pdfIn PDF document text
    • http://werojati.getenjoyment.net/learn_backend_development.pdfIn PDF document text
    • https://miletotafog.weebly.com/uploads/1/3/4/7/134758503/1ae0573a2d.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/30615714378.pdfIn PDF document text
    • http://edayafar.xyz/dayton_horizontal_band_saw_manualie5y0.pdfIn PDF document text
    • http://kemikavar.mypressonline.com/xiwaxomi.pdfIn PDF document text
    • https://dawukobisoxewi.weebly.com/uploads/1/3/4/0/134040495/52d79c84d.pdfIn PDF document text
    • http://azorocheat5.xyz/83770131428gcesu.pdfIn PDF document text
    • http://atlas-copco.su/tohatsu_5hp_outboard_manualuxben.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://geforagegi.atwebpages.com/giwasetimo.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/kafafeb.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/vedezogimusetozutifeno.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/azhar_all_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/gomowipoxarajovelo.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/photo_size_minimizer_free.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_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 5368 bytes
SHA-256: 7fb5e22b8344461f3b4c269ccac2ee2c1ec9b7bbdfb761712eb4b3597684bd74
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 10828 bytes
SHA-256: 57ed01570fb6f7c650be10215eb4153feb0c6f08360e1658fcdab43c52dcaedf
font_02_sfnt_off00012281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12281 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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