Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec668560d8c1504…

MALICIOUS

PDF

78.1 KB Created: 2021-03-13 23:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7a792439822e1abb48532f405d226c18 SHA-1: ef53b98055a89e3d10bd0cce034aa06025d489c8 SHA-256: 9ec668560d8c150443479b52b542c5f984d92dea79cb815f98975bd17f0d6814
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://kuzutuzo.ru/strik?utm_term=who+won+people%2527s+choice+awards+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446015/normal_5fd3811c2c803.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/tivijitotutolaputemidut.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/hhtpSdd/76834984441.pdfIn PDF document text
    • http://dinewegivogofe.mygamesonline.org/44888528246.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369508/normal_5fc7924665425.pdfIn PDF document text
    • http://didegarop.22web.org/49357813274.pdfIn PDF document text
    • http://sosabuso.22web.org/jabiruxowexodafeberux.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/hlYxiaz/29521032984.pdfIn PDF document text
    • http://punejew.mygamesonline.org/82384093791.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/eieihbx/star_wars_galaxy_of_heroes_games_like.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475564/normal_5fd04fede6827.pdfIn PDF document text
    • https://cdn.sqhk.co/kofelejezem/8BMYjgg/78409186043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499942/normal_601f2a54dc1ae.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://jawuwibunoropo.atwebpages.com/cours_sur_la_segmentation_marketing.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_35f71f9311c24736b41074f03b1b8bb4.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_217fd5a9ad484b74bb80634411cec536.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_ac0c16dfb7294a2185487d9114f0524c.pdf?index=trueIn PDF document text
    • http://nusazonawo.epizy.com/husqvarna_sewing_machine_parts_online.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_a141748cdf15412488e0d140b52026f5.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_258948a92cf444e39ab744d401f25825.pdf?index=trueIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_cb5aae1b06d94b6e874bc1171397f025.pdf?index=trueIn PDF document text
    • http://lamupilabixekuw.epizy.com/boat_trailer_guides_bass_pro.pdfIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_10bb8b3a382a49b98359d4cad06fabd0.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 5528 bytes
SHA-256: 3868964e0ecbd88cbc24151ef25d2578831f96c453cbbf484a5e657ae1914abc
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 11324 bytes
SHA-256: ddedcd1874708a8aefbc616b3f71b9518505bdd71c922f8f3c9d23aa7c3c9b19
font_02_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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