Malicious PDF — malware analysis report

Static analysis result for SHA-256 8038a18a2d970558…

MALICIOUS

PDF

72.7 KB Created: 2021-02-13 11:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c79ab40c282c47a369baeca5a6befbf1 SHA-1: 1561b8b4f906afb28da6a99f022d716d0c268401 SHA-256: 8038a18a2d9705587d719a7bf861ebfdeafcd10d121da5e209735598113a064d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/wix?keyword=nba+live+mobile+mod+apk+unlimited+money+latest+version PDF link annotation
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/nofozore_jefizepuw_pafotafero_fatasabanuxosi.pdfIn PDF document text
    • https://cdn.sqhk.co/ruselaguzoda/ihkggif/tajav.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/Kijghhc/flat_pack_pantry_perth.pdfIn PDF document text
    • https://cdn.sqhk.co/wefegiwezon/JhikidO/mogekavatusiva.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/gcjjacS/wozijipuvodonadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489263/normal_60261ab3b7ab7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5ff2b55cab3cd.pdfIn PDF document text
    • https://cdn.sqhk.co/bozogekeji/jgg5jbC/bonapivisimelu.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/gihdn13/94960585772.pdfIn PDF document text
    • http://kamini33.ru/advertising_agency_corporate_profile1c8eo.pdfIn PDF document text
    • https://cdn.sqhk.co/degawatoze/DjcgfaW/candy_legends_codes_2020.pdfIn PDF document text
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/4295896.pdfIn PDF document text
    • http://goodshopsales.xyz/cesta_da_maricotawcict.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481271/normal_601000d887914.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/h0iffib/tozijupelojodoliwunuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_5fdc34246c7c0.pdfIn PDF document text
    • http://urott-hu.com/kirchhoff_s_law_questions_and_answersydw80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 5440 bytes
SHA-256: 8b86833f71310eea55bb64309c8849fc9ac83c3facc08d965cc25969343e2c27
font_01_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 10184 bytes
SHA-256: 4842dc54b71ed19b098a5d3a441dbc5f2001b07446acdf47192c20d39bc91279

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