Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a259c6e26b3903…

MALICIOUS

PDF

77.7 KB Created: 2021-04-20 03:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 848554f52b0891be2fa89a5e04c6a9e4 SHA-1: ce44e1361a31f1b056a0ff902ea5feb7d8477a2c SHA-256: d3a259c6e26b3903ebf4ce46b20778d165aba2a2578411549c64de733292c9d1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the PDF as malicious, specifically a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious content, possibly as a phishing lure or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=vantrue+n1+pro+dash+cam+user+manual PDF link annotation
    • http://webpost.pro/bnz_kiwisaver_performance0ltn5.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/ggibjfJ/14552277638.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/firisixedofu1uy9k.pdfIn PDF document text
    • https://rixowumunek.weebly.com/uploads/1/3/5/3/135330445/3856031.pdfIn PDF document text
    • http://itnegozio.info/satuluwisfqz6.pdfIn PDF document text
    • https://kibugisire.weebly.com/uploads/1/3/4/0/134018652/5599421.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/jcjdZt9/zeduvubug.pdfIn PDF document text
    • https://viduturuv.weebly.com/uploads/1/3/6/0/136082320/7996649.pdfIn PDF document text
    • http://smm-target.ru/will_there_be_a_new_percy_jackson_movie1w0wh.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/gchdhcO/spotlight_room_escape_level_4_door_code.pdfIn PDF document text
    • https://faxilazow.weebly.com/uploads/1/3/4/7/134725206/5916561.pdfIn PDF document text
    • https://keziputaxa.weebly.com/uploads/1/3/2/7/132711938/kiparewutuwudipa.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/hggggmD/35757675888.pdfIn PDF document text
    • https://puxodemidumez.weebly.com/uploads/1/3/5/3/135345879/lamuluf.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/bovomomapodu.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/8hgjhij/nopudusodubolinozamufu.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/09301a5.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/PMageHH/check_your_walmart_money_card_balance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_f3db30dbc68a4917a9352d35cc874851.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_795c910095ee4ec8b96005824d0d5b91.pdf?index=trueIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_384082b052394165ba915ce7e2adc23c.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_76b03fa5936b4aec90acc7ee792999ba.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_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 5332 bytes
SHA-256: 20426acd2f807698c93d2ae6e3016f9239dfe1e5ecda835104d9b725ede2bf77
font_01_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 12344 bytes
SHA-256: 95bfe96fb8485130ac9e983001cc6e37ad633a125e51f465015a741a5ec78ae0