Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8eca7431b347e5…

MALICIOUS

PDF

81.7 KB Created: 2021-02-14 12:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f99d3b92e3b30329d0d58b438c6fdb09 SHA-1: 954f4912bb62b11ac9e477703d28cb5dbb538d3d SHA-256: 1c8eca7431b347e5ff8e2d8ec8c93ed7e445d70cf61bc11bdcc6b24573abae91
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/wix?keyword=download+bbm+apk+uptodown PDF link annotation
    • https://cdn.sqhk.co/kitolitik/rJajgXu/jaxinokas.pdfIn PDF document text
    • https://cdn.sqhk.co/kakumipoman/z7jdRib/terra_nova_rain_shower_gel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365649/normal_5ffc8009db4ad.pdfIn PDF document text
    • http://doordash.link/mumotugevakuwebizozebebfyeo.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/ogfhiih/hockey_jersey_template_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/Ahfrjg9/elementary_assistant_principal_salary_texas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5feafee1bc454.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/Uhhficd/71454202216.pdfIn PDF document text
    • http://adanakebap.org/86870507126ws9x4.pdfIn PDF document text
    • http://1fps.ru/background_ppt_tema_sejarahm6sgn.pdfIn PDF document text
    • http://all-system7.club/automatic_mouse_and_keyboard_fullgu90n.pdfIn PDF document text
    • http://milanomoda-italy.website/jubodorijisiwisasuod8xt.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/jghdihq/pixoxelibosixolesekowed.pdfIn PDF document text
    • http://govnososal.xyz/54644719687krbj1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vofofoduwegakuv.rf.gd/62046416509.pdfIn PDF document text
    • http://ziwutaje.epizy.com/millville_nj_car_accident_report.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_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 5128 bytes
SHA-256: 64fa805e8d72f8d720c52c7d2ef32d5dda3bb5ef7a0a4baef40a044b7049b3e0
font_01_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 10948 bytes
SHA-256: 947d53a6cedf64cf5db282df7b59c800e492fa6f30bd3fc2643a5c4bb6ffb014

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