Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca4c0626410c9c8…

MALICIOUS

PDF

84.7 KB Created: 2021-03-01 09:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 18e919b2ed513545840f1cb618024ae2 SHA-1: dba16c0697ca86a06585b53a2268016cb900968f SHA-256: 0ca4c0626410c9c8c2ec65ca45988f0fe3b8e572f6178136203e1618e29a95a9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The primary URL, https://vilenefex.ru/strik, is presented in a way that mimics a search result, suggesting a phishing or scam attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

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://vilenefex.ru/strik?utm_term=how+do+you+know+your+jlab+headphones+are+charged PDF link annotation
    • http://instapriz.website/light_bulb_cheat_sheet9zgxb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475738/normal_5fe32acee9cad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486356/normal_5fe569b880852.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/gjcigid/17616248524.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/idRjeGf/amtrak_train_517_on_time.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/hd0ZFhg/30908948404.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/7WifiiG/lagugaponusulivek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_5fe89d15400a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dexixikix.epizy.com/steve_madden_platform_sandals_near_me.pdfIn PDF document text
    • http://donirodep.epizy.com/simile_and_metaphor_worksheet_year_5.pdfIn PDF document text
    • http://siwojanapav.epizy.com/69482050200.pdfIn PDF document text
    • http://fereralud.epizy.com/install_android_sdk_ubuntu_16.pdfIn PDF document text
    • http://suwekijixi.rf.gd/26191665758.pdfIn PDF document text
    • http://danetuxu.rf.gd/poragivosezisanoke.pdfIn PDF document text
    • http://golujaxi.epizy.com/3393179253.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_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 5772 bytes
SHA-256: de41674269316f1c41d124e72c9630386660a190f7c491118581c2095372be10
font_01_sfnt_off000120d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D7 10744 bytes
SHA-256: adad350a707f9a253ca319e368f3525800f2d6db81b506d5c36b67ac68459b3c

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