Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc0ffbfd9be8b4f…

MALICIOUS

PDF

73.7 KB Created: 2021-02-24 01:22:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 52ea868143cbbb13a4f42cc3bfe537d3 SHA-1: ec748cfee4440229167305a21816c82d2da4aeae SHA-256: adc0ffbfd9be8b4f83771870dc786ec7b61f078cb525464f27acbb3ad5b89de1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a prominent one leading to 'leonvi.ru' disguised as a search result for a security camera manual. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/wix?keyword=swann+security+camera+owners+manual PDF link annotation
    • http://discovljzg.fun/610644400534a0qh.pdfIn PDF document text
    • https://budafamilefa.weebly.com/uploads/1/3/1/4/131452884/tasag-lonixodixemisir-dovonuvekosadun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5fddb0231fb1d.pdfIn PDF document text
    • http://sorekivobu.22web.org/the_boy_in_the_striped_pajamas_school_project.pdfIn PDF document text
    • http://waystep.site/communist_manifesto_word_meaningkhz0z.pdfIn PDF document text
    • http://mugedly.xyz/atkins_fisico_quimica_8_edio1s323.pdfIn PDF document text
    • https://wirolarem.weebly.com/uploads/1/3/1/6/131636642/ed7bdb59e61e.pdfIn PDF document text
    • http://vijufik.iblogger.org/22175542577.pdfIn PDF document text
    • https://furimulu.weebly.com/uploads/1/3/1/4/131411024/bavezimij.pdfIn PDF document text
    • http://forecast.bet/456696764027gbpk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dekifovep.epizy.com/foxit_reader_for_android_apk.pdfIn PDF document text
    • http://ralipuzejemozuz.epizy.com/86625656998.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/49077379100.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/mama_bear_legal_forms_promo_code.pdfIn PDF document text
    • http://lalafen.epizy.com/33039983178.pdfIn PDF document text
    • http://sosozodazu.epizy.com/23672771945.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_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 5244 bytes
SHA-256: a6031ddbb42f4494fc525f83a4b55a131c93ced96a607c76acd95df52a055ed3
font_01_sfnt_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 10440 bytes
SHA-256: 020294432587d218bb38999d689cb0aaad729e6b5726feeac6f3f46d06543891

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