Malicious PDF — malware analysis report

Static analysis result for SHA-256 0765c5ac2f637398…

MALICIOUS

PDF

61.5 KB Created: 2020-11-10 13:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3348adfa23a02fc9d21521de9a5a4931 SHA-1: 14f819ccaf8f0e4f32f37b88af2de9b0674d1f06 SHA-256: 0765c5ac2f63739840fabc04cc637da4484b8cf994c5cd646072f75d2b4b2134
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 0.9997

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://traffine.ru/123?keyword=skip+counting+by+10s+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379230/normal_5f9adae672e8e.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/novusiwimuguv_taguvepiro_fadefexanupa.pdfIn PDF document text
    • https://monuwapomobi.weebly.com/uploads/1/3/4/7/134730240/jujajenimupav.pdfIn PDF document text
    • https://xesamubi.weebly.com/uploads/1/3/4/0/134095888/1633686.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/sigerufubo.pdfIn PDF document text
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/kusigatarer.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/d4ccd6b7.pdfIn PDF document text
    • https://dikanutedageke.weebly.com/uploads/1/3/4/4/134457663/gisawelul.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/26a2f41d-a1a7-4ef6-8180-f5a500bc79ea/ticketmaster_service_fee_coupon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3246e65-7fe3-450f-94e3-2c761419f657/soul_worker_brooch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36075f2a-173f-43f9-831e-dff0a7029ca7/75149752489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece79693-68ad-4743-af84-6ebe2554ad94/lokudonovokimezaxawi.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/61199139205.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/gta_san_andreas_download_free_apk_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/070dd9d2-902f-47d9-848c-5e67c651e989/bupop.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_off0000b61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61C 5648 bytes
SHA-256: 0da262efdc23179e1e3fb77d46c41b220a79e837fb22caad0a9031145c0d4d63
font_01_sfnt_off0000c970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC970 9352 bytes
SHA-256: a69bf7d8e232a0200e6994702d108908e4bf311e1de4cd793f59c356d08c9c56

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