Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f08ef5b440cd85…

MALICIOUS

PDF

70.8 KB Created: 2021-03-31 01:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0688da29721f26ff37c452661476d6c1 SHA-1: e3eb363629d605ecf76c420a534385a036657b41 SHA-256: 51f08ef5b440cd8598a9b08208d351f2c75cc5e1e59978dbea607d47f20ada68
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' indicates a malicious intent to trick users into downloading harmful content. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/123?utm_term=manufacturer%2527+s+declaration+template PDF link annotation
    • https://cdn.sqhk.co/dabozijide/aEdVsME/red_ball_4_moon_game_online.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/what_old_movies_are_on_hulu.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/gryibjh/monument_valley_ut_camping.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/2f4ba9.pdfIn PDF document text
    • http://sivolejujivozul.scienceontheweb.net/75533793483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387433/normal_5fffb3aae26cf.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/obsessive_compulsive_personality_disorder_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_6052e27aa6cf2.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/Tl9hcjZ/zigulesekabokinasuxozavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_6035a316a2242.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/bCwjdia/71053724873.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/igIAbja/28898652312.pdfIn PDF document text
    • https://cdn.sqhk.co/temetixufuxi/5hi3QHV/88662940027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_605b844425043.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/samsung_wb35f_camera_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_605d6bf234f9a.pdfIn PDF document text
    • https://zigibopujomez.weebly.com/uploads/1/3/5/3/135350997/varosupimufegitu.pdfIn PDF document text
    • https://nakupibizotan.weebly.com/uploads/1/3/4/7/134730769/7244ece2d3614.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/Nighigh/download_blocky_highway_mod_apk_home.pdfIn PDF document text
    • https://pebuxunuvir.weebly.com/uploads/1/3/1/4/131483235/konepa.pdfIn PDF document text
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/498647.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/htet_application_form_online_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/25021077821.pdfIn PDF document text
    • http://xedemigu.atwebpages.com/new_york_times_crossword.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/assamese_full_movies_mission_china.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/97131042379.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_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 5340 bytes
SHA-256: 46cbbe4716d3076cbfd9c93b1c057f7c995a0063884b497c1836a57eb504af11
font_01_sfnt_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 10244 bytes
SHA-256: 594fb96c6dd93fa32dcc715d26764ef41a230ef1056bb39881d0ce0631583b1a

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