Malicious PDF — malware analysis report

Static analysis result for SHA-256 c308303c4b90d531…

MALICIOUS

PDF

75.7 KB Created: 2021-04-15 09:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2f365ef7764d982a87884a46059c70f5 SHA-1: 10e9d6f435e0e05dfadb51436deeda8ad98230ed SHA-256: c308303c4b90d5312ee1472e81c9a627fdeb3919476c68f11d6fc5fe424f7fa8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=what+is+a+5+percenter+in+law+enforcement PDF link annotation
    • https://jifosibupegexuv.weebly.com/uploads/1/3/4/6/134692258/difujerez.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/sex_and_the_city_on_netflix.pdfIn PDF document text
    • http://mirijesuwakug.sportsontheweb.net/ajax_php_mysql_tutorial_examples.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/7b94a0061f818e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_6018d76393421.pdfIn PDF document text
    • https://buxijabis.weebly.com/uploads/1/3/5/3/135329720/2443022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476446/normal_5fe159ed8f3d3.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/18173123226.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/97081107303.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383470/normal_5fcd519369369.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/public_relations_ebook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_c52fa270002b41849b78424b7442600a.pdf?index=trueIn PDF document text
    • http://losaxaratenelet.rf.gd/news_of_the_world_movie_review_nytimes.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_2d56e3e1e3524268b4802f4507d80534.pdf?index=trueIn PDF document text
    • http://wubogijogazerew.epizy.com/36623045449.pdfIn PDF document text
    • http://sefogozi.epizy.com/rovefiwulam.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_c65cf11f3d3b442ab4c77c30fcbd2a3c.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_1e9fad7daa37478795d3ece815d90ae5.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_d7bb7efe68f6429fac9efd8a901c00e8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 5484 bytes
SHA-256: 46854cabfb4dcf2e4847de6b1014ba546de36cfbb02ae02a58785e1331ac94d2
font_01_sfnt_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 11128 bytes
SHA-256: f142eab4c01946bdaaba82b316136157a0acd500dd7873816d310856dd0077ff

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