Malicious PDF — malware analysis report

Static analysis result for SHA-256 add8ba97dd141220…

MALICIOUS

PDF

78.8 KB Created: 2021-03-12 15:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 355e70683708c50d506e1e33fcf2ab7c SHA-1: af7f65e5edfcd78135ab419f874586f868bc2fd7 SHA-256: add8ba97dd141220f4fe34d44be2528c8e6a75ebc64a4c140fa1083d7adcc2be
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 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.
  • 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://ponafet.ru/123?utm_term=background+slide+powerpoint+yang+menarik PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484806/normal_5ffe6a95b44d4.pdfIn PDF document text
    • http://kimidenexikox.getenjoyment.net/jobibidebuzinaweze.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/persepolis_graphic_novel_chapter_summary.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/44703815607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371005/normal_6002fb7ac539a.pdfIn PDF document text
    • http://basagutidabe.sportsontheweb.net/sanitary_inspector_entrance_exam_syllabus.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/rekorewexidiwo/longdean_school_hemel_hempstead_ofsted_report.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_7832e863b3a549399869d6650cc0f7d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05d75ecc-c607-436b-8d8c-c83140b58d7c/how_to_play_an_organ_with_chords.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_91fc07113e9a4d628e72815bd5482dd6.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_c718b98007834d66b3b958426696429b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e797629f-41d0-4cb0-84cf-d3f0ec38871b/how_do_you_remove_a_flow_restrictor_from_a_grohe_kitchen_faucet.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_e17f1cb67462421f93e541feaa350653.pdf?index=trueIn PDF document text
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_ef8cd3973c6c4d06810e09323835a3ec.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_dcd7387fe72b4b8bb8b2b33efa1df058.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a493337f-8cc6-4766-9fbc-829e8c5984e5/serinap.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_04e2a9628e254da29588a927553c048f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/cellular_pathology.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_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 5700 bytes
SHA-256: 5d3a66ce3afe9ef1303f03feb3fa4cc6aaed0795167df380b352ed0add4c1316
font_01_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 10444 bytes
SHA-256: 5603841d21c0a4136eb935ad299a59efa4378de2f089c9d579068fdccc316ff6

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