Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a41c45f88cbe4c…

MALICIOUS

PDF

68.2 KB Created: 2021-03-15 17:58:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 509fbd78921522c1be116e26cd25d4ed SHA-1: ef8a0e3055c624ec130f04b94038e9424b31d2a6 SHA-256: 01a41c45f88cbe4c83c8f9c684613ee82d8f71c897c6e29311c5a228cb101a4c
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 numerous embedded URLs, with one prominent external URI pointing to 'mezovuduw.ru', suggesting a redirection to a malicious site. The document body is heavily obfuscated, but the presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, reinforcing the phishing lure.

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://mezovuduw.ru/aws?utm_term=radar+navigation+and+maneuvering+board+manual+pdf
    • http://yesstore.pro/67140447272619hl.pdf
    • http://instahelpforbusiness.com/arturia_v_collection_5_crackeaot1.pdf
    • http://sell-toclick.online/dozafoduwesejoxulk5yjt.pdf
    • http://teagreen.space/64350093859irr2l.pdf
    • http://quickpapp.online/11616854959ziomt.pdf
    • http://burutevopu.iblogger.org/guginaxutosovudevowuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b9829893-e34e-4d2a-b55c-9a3737826f9f/xiwewakazitelugufafawil.pdf
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_980bea45db9e4363bf5782eae809d2c1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/953b369f-b37b-4c54-bf82-85f2360cacd6/how_to_reset_danby_portable_air_conditioner.pdf
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_32d9c6f3c6da4d13962600cfa480a448.pdf?index=true
    • http://merofis.epizy.com/kaputokixifugagog.pdf
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_aa20e8daf1f34438b93776f7b6692017.pdf?index=true
    • http://selosaxugi.epizy.com/kamegogomigunarixurusuguv.pdf
    • https://uploads.strikinglycdn.com/files/02553994-7fc4-4231-b0f9-ad9d7bd15b5d/stihl_leaf_blower_vac_electric.pdf
    • http://mexesumofiruvaf.rf.gd/65070419724.pdf
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_ea73c801a28e428ba9b6ccb109455e66.pdf?index=true
    • http://bukofitezude.rf.gd/whatsapp_new_version_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cca6.bin
49d37f3a60dadc703b1373217ac99265ffe27c610c881068ce92a9a348a37d2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA6 5392 bytes
font_01_sfnt_off0000def4.bin
370974dbb46d83a606e7df3963c460acfadd8b3c05577c11bf532e423c1143ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 10792 bytes

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