Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7cbb7d27e69f4f…

MALICIOUS

PDF

67.5 KB Created: 2020-12-24 00:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a9583dd348cf91f5a1001f40e66d34b7 SHA-1: 8149ba2486bb22dc941cc31efca019b9feee3527 SHA-256: 6a7cbb7d27e69f4f9f31f855a2f6bf586b8b532764451c17ff5114df83eea7dd
156 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 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 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.
  • 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://trafffe.ru/strik?utm_term=90s+music+playlist PDF link annotation
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/a8a19489b625de3.pdfIn PDF document text
    • https://cdn.sqhk.co/mozejipakas/ghaAjdO/wotosudu.pdfIn PDF document text
    • https://valetakomo.weebly.com/uploads/1/3/4/0/134012509/7318621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5fb4b55cd8ed9.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/Z4Ridi6/best_notification_ringtones_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/113211c8-5249-4bfa-aa2b-f5a8eb3f3af3/62672619336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50773106-20e2-4670-a6ee-dc25c9a778d5/relolixar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b1e3c87-c9a6-4c9b-b489-18a510a34e16/concepto_de_infancia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12bd005a-1ec9-4499-9e8a-b3d98704d62b/nivivakirakagogudakek.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/mumawomijipoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4a7408-6d4e-4ad7-ada5-bf92da76c83d/lion_king_script_writer.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/3d_gold_font_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d76b48-3eaa-4658-8809-25603ee2b67a/badminton_smash_activities.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_off0000cb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB21 5288 bytes
SHA-256: 5486ad48d660d39e70333a1d67ce32b9fd1c5c779708f663956eb17700d6d879
font_01_sfnt_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 10892 bytes
SHA-256: a952898b1cb14ddb346ce6843a1c4af619f13af7fe719c9274ed9de919b11685

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