Malicious PDF — malware analysis report

Static analysis result for SHA-256 2767270d21c61bd8…

MALICIOUS

PDF

80.8 KB Created: 2021-05-07 06:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 23618b8b1236301f6589ba2bce97f228 SHA-1: 159d576fd30e5e62496c35295d6a2f1d55385e83 SHA-256: 2767270d21c61bd85ebeeb1d5dcccf825d97da1cf0ed1b10cd02ec991b6a18c2
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/strik?utm_term=tracfone+prepaid+lg+rebel+4+lte+%252816gb%2529+-+black PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410983/normal_6044ce3e306a2.pdfIn PDF document text
    • http://fodamibokaf.66ghz.com/cbi_officer_south_movie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410952/normal_5fd0817bcdd15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_6009ee2306cd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_60158d67a3925.pdfIn PDF document text
    • http://fifewub.22web.org/what_is_classical_behaviorism.pdfIn PDF document text
    • http://hellesypakk.online/regifabuligopoxuimod1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472776/normal_5ff820d92c584.pdfIn PDF document text
    • http://procripton.com/vuxorasitefedokilopavixowomnm.pdfIn PDF document text
    • http://pobalulegofi.22web.org/what_is_energy_storage_in_plants.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xozinosawadijak.rf.gd/48712230450.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/liponogija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0291c42-8c24-491f-be03-25b59bc9ba73/alpine_cde-w235bt_bluetooth_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f29e95-44c6-45c9-b9b9-32c806e6f916/sumowadominozegi.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/depazitogelubimurogiw.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/dagudorufovewakuxinesoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8155c265-0201-4e21-81a8-80034092373c/beowulf_burton_raffel_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/rereading_america_sparknotes.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_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 5780 bytes
SHA-256: 1b129d9096da8f44e4fee601855fc93520a44043399bedaf103977692850cf78
font_01_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 11036 bytes
SHA-256: a97d261e518d54e573094b529bdc9d23d50e5edbf7abf369f9a5a8a1bd57d810

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