Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c02246c04c30dea…

MALICIOUS

PDF

70.1 KB Created: 2021-03-16 12:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2001e7cc6141b386f2faa6df660a2df SHA-1: 7a190a5b790a0850ed8375d68250b793ef95175b SHA-256: 5c02246c04c30dea65953d98bf059f2f88826acd8aaf0fd38ad464bc4412c39e
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm for SEO manipulation. No scripts were extracted, but the presence of numerous links suggests an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/123?utm_term=kannada+mass+dialogues+audio
    • https://cdn-cms.f-static.net/uploads/4388272/normal_6037cc3c60422.pdf
    • https://cdn-cms.f-static.net/uploads/4451970/normal_5fd0bf4c70ed2.pdf
    • https://static.s123-cdn-static.com/uploads/4422627/normal_5ff3f782cd071.pdf
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5fd2a03d4adf2.pdf
    • https://cdn-cms.f-static.net/uploads/4455884/normal_60131850cd3ef.pdf
    • https://cdn-cms.f-static.net/uploads/4370267/normal_5fd102cc02ba5.pdf
    • https://static.s123-cdn-static.com/uploads/4457330/normal_5ffa83877faec.pdf
    • https://static.s123-cdn-static.com/uploads/4465403/normal_5fcc1a793dab6.pdf
    • https://xupovefodifej.weebly.com/uploads/1/3/6/0/136053951/dezijewemafaver.pdf
    • https://didegesub.weebly.com/uploads/1/3/2/6/132681352/loloxedoxose.pdf
    • https://static.s123-cdn-static.com/uploads/4530846/normal_5fee3c620deee.pdf
    • https://cdn-cms.f-static.net/uploads/4452621/normal_5fe9ceae9564b.pdf
    • https://cdn-cms.f-static.net/uploads/4385848/normal_600dec537d684.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_d38e5909296b44b5b4925d366a32f050.pdf?index=true
    • https://s3.amazonaws.com/jezaxojipevu/warehouse_layout.pdf
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_7bdddc1131cc4955bad119a6069146cb.pdf?index=true
    • https://s3.amazonaws.com/lorifumofelu/nibelulebatenojuwab.pdf
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_1e98af0b1803456a986ee1cca18ce9f6.pdf?index=true
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_54e09f05acdf4f21b255c8a6618646fc.pdf?index=true
    • https://s3.amazonaws.com/wanasuvedigo/euripides_v_bacchae.pdf
    • https://s3.amazonaws.com/sajatesawodiji/98695094888.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caab.bin
172599af01dd0268b82081b48dc6a72b9488f187234e504b9f64c2adafa6faa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAB 5020 bytes
font_01_sfnt_off0000dbb1.bin
6bd17c643aa192cc0bd5c450d1ae7ce1830336a3a3e3b984053506318c1d36e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 1988 bytes
font_02_sfnt_off0000e58c.bin
dc0685a8c426473d5af3c8a74ca2209d5c7625720ac311b5997cc73daad776a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 10840 bytes

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