Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b614b878d50da20…

MALICIOUS

PDF

78.7 KB Created: 2021-02-17 17:35:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bc2a4042f54aa8cc6667494e369cdc13 SHA-1: 2202edd88efd5cb8c9266d1c27287611915f4e73 SHA-256: 5b614b878d50da20aed57adce8be5d253cb2367be3ee2a6d588aa99dee06fbbe
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://jottigo.ru/strik?utm_term=o+que+mais+cai+de+historia+do+brasil+no+enem PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366660/normal_602a87a7e68af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421639/normal_6029341c03b0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_6004748b5ca5d.pdfIn PDF document text
    • http://belldiscount.ru/leluze4dla7.pdfIn PDF document text
    • http://futup.ru/rilesadifadulijyf24.pdfIn PDF document text
    • http://motirepefasake.iblogger.org/mavorelizudiladugilog.pdfIn PDF document text
    • http://hellochildren.online/mercury_barometer_and_its_uses44uv8.pdfIn PDF document text
    • http://mastericy-chistoty.ru/zoosk_free_code21kgh.pdfIn PDF document text
    • http://esparks.ru/catching_fire_movie_free_downloadooqps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/kimanopuwalila.pdfIn PDF document text
    • http://murarefap.epizy.com/81764683156.pdfIn PDF document text
    • http://zemagarekerak.epizy.com/51744753669.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_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 5472 bytes
SHA-256: 6df70d908e38e77f827fd7452a24c0ddacda8bd436fd21bf3a446c94d64b7de3
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 2092 bytes
SHA-256: 78e94e2e47178245ca437e301e19f50dc99845ecc02da2ba30fe2b1e34051cc2
font_02_sfnt_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 13144 bytes
SHA-256: 17bfcb74893688b557b5dd55841b0ecf66d6134ab399a89dd9a33c2803410377

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