Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6372d3e5d04b9a3…

MALICIOUS

PDF

67.6 KB Created: 2021-03-02 02:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 906a78188a474214dcb86f983531f43a SHA-1: 596c64827d0a8210ac95877500dabb2c1a69cc51 SHA-256: e6372d3e5d04b9a3ef3626c0bf0d929f6efca8c05e6140de12611e12e4446d41
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains numerous external links, many hosted on disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many links on low-reputation domains. The ML classifier also strongly suggests maliciousness. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/strik?utm_term=internal+combustion+engine+fundamentals+by+john+b.+heywood+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454809/normal_600a53559dbca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471985/normal_5fe4e28d67aec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460241/normal_602ab087d9708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443588/normal_601db0e59972a.pdfIn PDF document text
    • http://fortysgjdk.fun/94597449596c9pod.pdfIn PDF document text
    • http://usacreditreport.info/xonajemajumokejs4ln9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453730/normal_6025e38888c3a.pdfIn PDF document text
    • http://ostanni.fun/384017963278iklz.pdfIn PDF document text
    • http://jixelaxoli.66ghz.com/17675049459.pdfIn PDF document text
    • http://hermidkovo.info/17362897455jn07m.pdfIn PDF document text
    • http://jobudafeva.22web.org/how_to_change_heating_element_in_maytag_bravos_dryer.pdfIn PDF document text
    • http://moneyindia.site/tmnt_mutant_madness_character_tier_list16iea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxofepugoloma.rf.gd/multiplying_monomials_and_polynomials.pdfIn PDF document text
    • http://sosubixoza.rf.gd/87795981509.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/3091845701.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_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 5948 bytes
SHA-256: b05de20f48a386a0b2f8f76ba67eb8b932849a6608e6e6dff830bbb6f49d6150
font_01_sfnt_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 11336 bytes
SHA-256: ad6e1fd007e83d6aad7d9b1cc3ad9bebdbd39b3cfc8e43e3f9da6ab4ebf9bc32

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