Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6f92cf642b7821…

MALICIOUS

PDF

77.5 KB Created: 2021-02-19 06:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3e90025b9083d87c3da0c3e68390fe06 SHA-1: cbc5249368d61ac030cce3ebd94a845094d5959b SHA-256: ef6f92cf642b78213cac7c11df2cc29e96a21989f433f7793dbf697f15b2b9e0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are commonly used to host malicious content or redirect to phishing pages.

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://druttle.ru/strik?utm_term=how+often+do+you+get+paid+at+dollar+tree PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465018/normal_5fd6280823ab8.pdfIn PDF document text
    • https://lepoboniw.weebly.com/uploads/1/3/0/9/130969744/4807999.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/c24959b90.pdfIn PDF document text
    • http://edevletorg.com/55907456389e10ye.pdfIn PDF document text
    • http://netabemoli.22web.org/nuance_omnipage_trial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450502/normal_60038e9d8179d.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/BGBBhak/chess_openings_free_download.pdfIn PDF document text
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/jopumitufitakiw-gegekojepudugoz-fedudol-koxumitemoro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479678/normal_5fe27ac10883c.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/jgPjaz2/pokemon_go_friendship_level_up.pdfIn PDF document text
    • http://pojezer.iblogger.org/dixazigit.pdfIn PDF document text
    • http://1green.space/rejexomurego3gdoz.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/icIChid/mars_weather_radar.pdfIn PDF document text
    • http://kernig.pro/what_are_not_examples_of_computing_innovationsqlw0q.pdfIn PDF document text
    • http://lunesygets.xyz/life_is_strange_phone_codeddpk3.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/WhZsHha/bombsquad_remote_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5fcc49e4ba749.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://ritofeli.epizy.com/10322266848.pdfIn PDF document text
    • http://burekopuz.rf.gd/singer_tiny_serger_manual_espaol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 5068 bytes
SHA-256: c5575e2b22fbeb8f317dc9e65a2013a18b8cb7c98086f538f96ad8e0db3155c6
font_01_sfnt_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 10996 bytes
SHA-256: 5fe102da55bf4970fb009ab80f8421f34bbb2bd436eed2e92ccdabd44544dac2
font_02_sfnt_off00011a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A75 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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