Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5f2d6a48cf5afd…

MALICIOUS

PDF

78.1 KB Created: 2021-05-09 02:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0f94c093cd5f306a7140cba47590c336 SHA-1: ccc22eca4dc21c987d2dfbdb962104ec003a6814 SHA-256: ff5f2d6a48cf5afd6c92266b70e47c292d8556760fe4f825d3e6fbcc9487150a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains a lure related to 'how to enhance intimacy in marriage' which is likely used to disguise the malicious intent of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=how+to+enhance+intimacy+in+marriage PDF link annotation
    • http://pumaguli.scienceontheweb.net/accident_and_emergency.pdfIn PDF document text
    • https://rejasujewefem.weebly.com/uploads/1/3/0/7/130738882/e570127853a317.pdfIn PDF document text
    • http://tryplafond.xyz/nomeliveju2quix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443804/normal_60654c9a99c20.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/xapitirefogixu.pdfIn PDF document text
    • http://bioforce-co.site/roxikotipakogojitanpqou.pdfIn PDF document text
    • http://nufivuzelikonax.getenjoyment.net/kala_bhairava_story_in_tamil.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/73136314828ifo8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_601834328dd20.pdfIn PDF document text
    • http://hookup668.site/45066844123or9fm.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/heron_of_alexandria.pdfIn PDF document text
    • https://pewoguliburutoj.weebly.com/uploads/1/3/4/2/134234653/movolife.pdfIn PDF document text
    • http://italia-doc.fun/batuzebovubobi1i6.pdfIn PDF document text
    • http://cabinetsapp.xyz/muzukuperidudoverasiwenzb4c0.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/roland_xp_80_manual_espaolbkse3.pdfIn PDF document text
    • http://select-get.top/sokibawixuputo7hugg.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/83b9a.pdfIn PDF document text
    • http://lerob.info/76401690591tbd99.pdfIn PDF document text
    • http://alkim.xyz/witcher_3_strategy_guidet4kgy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saxodanokijaj.atwebpages.com/horton_hears_a_who_full_movie_in_hindi_dubbed_watch_online.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_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 5160 bytes
SHA-256: 72f1474989aaf11bbb32e90218254cb05c1fe2f458eb5b49623324fe7d4ad6a9
font_01_sfnt_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 11300 bytes
SHA-256: 6a3e66ba7d0af3154d0da4729a6c149866345166b1d61eb007e73214cb3e102f

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