Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc66131ee2f2a841…

MALICIOUS

PDF

86.7 KB Created: 2021-03-24 06:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 02e2d505363d3fdb0bc5a8330258a563 SHA-1: 827e390ff841d087cfa67206991a4035d1a956ee SHA-256: bc66131ee2f2a8418e0b3d909b49c4072eea51ed6f7503cb57affd21507d23e5
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 0.9997

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://dafemum.ru/123?utm_term=arturia+keylab+essential+49+user+manual PDF link annotation
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/cc497b096c11.pdfIn PDF document text
    • http://basijinogasa.22web.org/34150145597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494893/normal_5ffc667981a6f.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/khfgd4c/kajotuti.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/eZjcegh/cute_baby_boy_skins_for_minecraft.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/4263766.pdfIn PDF document text
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/nilatoko.pdfIn PDF document text
    • http://ferategaj.scienceontheweb.net/adobe_xd_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5fd27eadc8731.pdfIn PDF document text
    • http://jezefumivodasaw.22web.org/gibulaga.pdfIn PDF document text
    • http://bovibuvebus.getenjoyment.net/gupulibodakasilunoviwipa.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixijine.rf.gd/1838308398.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/quantitative_data_analysis_techniques_example.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/80234114016.pdfIn PDF document text
    • http://zejekaliv.epizy.com/61920459580.pdfIn PDF document text
    • http://pedamodaw.onlinewebshop.net/causes_of_water_pollution_seminar.pdfIn PDF document text
    • http://nujobig.rf.gd/37194332067.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/74804510593.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 1600 bytes
SHA-256: 1724676e59e7aab41db0eed5afeccaca18f765094e22404ecccd4f59f0e4b23c
font_01_sfnt_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 5372 bytes
SHA-256: 551fefca79adcc254d001d3cfea86ace56e5f82d57c1854a52c6f1ce7c2353c0
font_02_sfnt_off00012496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 11388 bytes
SHA-256: 4df9f2cd94ba08595178372159187c882d46a3c217a9d869a1dbbe40827f355c

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