Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd57c9001707ef1…

MALICIOUS

PDF

88.3 KB Created: 2021-03-11 02:05:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3fb74d7bdcbc8487263764df5e03721a SHA-1: 791e57c89cea7f4cf485b3df147820e8ef29d4c9 SHA-256: ddd57c9001707ef1a25aa3569f53ae53e5e4aeeab9af0a3fa9b3369958adbcdf
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/award?keyword=tipos+de+diagnostico+comunitario+pdf PDF link annotation
    • https://cdn.sqhk.co/leguzufaju/bVlhfhg/real_car_parking_simulator_car_driving_academy_games.pdfIn PDF document text
    • http://muwazowezijowa.22web.org/android_10_nokia_x6.pdfIn PDF document text
    • http://menozamula.22web.org/hillsong_united_aftermath_album_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/hifkOgd/biwevi.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/b113641.pdfIn PDF document text
    • https://kafunuxuvivupar.weebly.com/uploads/1/3/5/3/135303333/7122116.pdfIn PDF document text
    • https://cdn.sqhk.co/sivunukiwe/Jmwicja/aarp_spider_solitaire_game_online.pdfIn PDF document text
    • https://perelixaji.weebly.com/uploads/1/3/4/8/134881923/gowokifokafimowujiba.pdfIn PDF document text
    • http://povonuzakor.22web.org/samsung_s9_release_date_in_india.pdfIn PDF document text
    • https://dimutaribosisup.weebly.com/uploads/1/3/4/4/134444719/jazegomonamidikuvaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nawogov.epizy.com/acrobat_pro_offline_installer.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_8c04c60d29e44916acc5e5165c17e815.pdf?index=trueIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_9713d3a2e359457eaf0197da28903dc6.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_d6cc5a71d89d4b6f9b11551d6d7a93c3.pdf?index=trueIn PDF document text
    • http://nasewuji.epizy.com/wezixorekiwaxipakufu.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_80991514ac7f4d8ba0b508b62bb0fce1.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_ce7dd21c2dd64ad5b3e20366cee8e80b.pdf?index=trueIn PDF document text
    • http://mokineso.epizy.com/juxoravu.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_d283cb1c452d42a288f8bc3ba9b3886e.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_cee72c08ef2341b9becbb1f2c8f7c9aa.pdf?index=trueIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_9590b70c39324d82a436cd4d3f30ecc0.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000134c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x134C2 18284 bytes
SHA-256: c875372970dff311028a99e12ce55be8d4c4a442b8212988e57562193b4b2421
font_00_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 5392 bytes
SHA-256: 7a2c932a3aa081eb21dfd4d77bd161243b9a7a24a96f38835094b4c604da1751
font_01_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 10808 bytes
SHA-256: f57ec47510017acf833345e7dc91bd4111d122f93f62bea67715fac31878018e

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