Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a8c1435361337b…

MALICIOUS

PDF

75.2 KB Created: 2021-04-22 00:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 856f9045a2b05fdfba582a93af91b350 SHA-1: ed6150eedbcd06f64e7b5c034476abb079ec15e4 SHA-256: 28a8c1435361337bc04be27ee32f51ec1152577596aef650f095e9f3476821f9
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 0.9996

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://ponafet.ru/strik?utm_term=what+is+the+easy+way+to+learn+python PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413347/normal_601bd2ffc1471.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463264/normal_5ff633300dc1d.pdfIn PDF document text
    • http://kitazixozakabu.sportsontheweb.net/pdf_apocrypha_bible.pdfIn PDF document text
    • http://pakunobun.getenjoyment.net/87387014202.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/80302359940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_5fd26ba781292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_602b95cecc3fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_60174236e5aee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425256/normal_5fe1856819abc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_605578466ff74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f2b666-29e2-4592-b87c-e176c24a1d91/panasonic_kx-t7731_intercom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/957ae898-32f6-4595-ad77-c73c5888c2f2/kofiromeresojiz.pdfIn PDF document text
    • http://dumawesujin.epizy.com/90252091315.pdfIn PDF document text
    • http://robebiwasufilu.epizy.com/varaje.pdfIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/cape_verde_map.pdfIn PDF document text
    • http://budekibume.epizy.com/birthday_party_planning_checklist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2b9180-51aa-491a-89c0-f80815f83044/41133195174.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_9d20fa48bdf845c0906b203db0b6dbed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/115bc6d7-b567-4883-b3de-61077b50df8d/zupirupa.pdfIn PDF document text
    • http://timagugovoxo.onlinewebshop.net/96361029492.pdfIn PDF document text
    • https://7d14b3fe-44ab-47f5-a5a4-fb5d7998febd.filesusr.com/ugd/ba499c_dfb23a8d71034ad1ae2b5f517060d9be.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

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_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 5116 bytes
SHA-256: 6447aa2f330eca9a630dde8add540422055613555161db7606a41131d8982902
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 10164 bytes
SHA-256: 17466f940274bdfb1804665ed69941dd77b6fc198536a02128fd233c34e61606

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