Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0806ff1660caef…

MALICIOUS

PDF

75.8 KB Created: 2021-03-25 17:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 71f6b534428f5c35c4da7e24a192d0c2 SHA-1: 5d132d2b0f852292f9efde275bf12cee317cc0d9 SHA-256: 3c0806ff1660caef669870da6059ef100f165f35614adabe243351622a638389
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to financial statements and PDF generation, which is likely a pretext to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/award?keyword=analyzing+financial+statements+pdf PDF link annotation
    • http://muvubaziforobe.iblogger.org/top_paid_android_apps_2017.pdfIn PDF document text
    • http://pollsexpert.com/padajepakodebodi0w425.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/xuzufozomewep.pdfIn PDF document text
    • http://rukawagamijo.iblogger.org/online_books_to_read.pdfIn PDF document text
    • http://weex.info/ihcl_annual_reportxipf6.pdfIn PDF document text
    • http://apkweb.net/apollo_twin_duo_mk2_price_in_indiav5mhg.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://wibifowomotab.iblogger.org/pevesupobifepazakamabo.pdfIn PDF document text
    • http://bivitajuteje.mypressonline.com/bsc_magazine_free_download_may_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402718/normal_602dfe927fa33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_604d2073791b5.pdfIn PDF document text
    • http://obmenkalnr.online/4884805937053bn.pdfIn PDF document text
    • http://dayzcommunity.info/vusunom87r2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504641/normal_60287490cb4c9.pdfIn PDF document text
    • http://irbestate.ru/kazezurawekevkssb8.pdfIn PDF document text
    • http://madamzero.com/ncaa_banned_substances_creatine5xeqq.pdfIn PDF document text
    • http://help-ruleviolation.com/silicon_valley_season_6_episode_7_reviewtru5j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416132/normal_60591cbc8d2b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://desasivitusuzux.epizy.com/16683196660.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/abhinetri_2_trailer.pdfIn PDF document text
    • http://vajexakatozezal.epizy.com/cadmium_toxicity.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/kobolds_and_catacombs_druid_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/juvugonesuwukowedojakala.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 5520 bytes
SHA-256: 7300c707cb00632204c1bd01237ef1ff543de77353a0ccebdc24a155c69259c7
font_01_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 9928 bytes
SHA-256: e6b1b0e9a87b4d8200c74260f93862d625464a0daa85e6ba1dc3b39168f46dc0

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