Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a822d0ac6177ef…

MALICIOUS

PDF

73.3 KB Created: 2020-12-17 02:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a6a31d57d666b4da53425bdec5929e3e SHA-1: 91a547954dc111d1c3ba12124b8607b979dee475 SHA-256: 60a822d0ac6177ef78a3b19155cd41a3c5e06ffe33d841599b95bc2248e728e7
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://trafficel.ru/strik?utm_term=gypsy+jazz+guitar+chord+progressions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480594/normal_5fac473fcaa5a.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/e175605ee56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fb46fd505e37.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/2820315.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5fccc003589c4.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lonevu.pdfIn PDF document text
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/98ac2039b681.pdfIn PDF document text
    • https://ladasewesadil.weebly.com/uploads/1/3/4/6/134665294/47b759958f1d7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_5fbd8d147a504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418171/normal_5fc0d06cf4172.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/12fda6a7-7be4-4a29-93dd-c243312e9f58/reaper_at_the_gates_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417091ac-ed91-4800-ac3d-c0bc0c6133ac/dibikexorelovafoveluruw.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/168._excel_sheet_column_title.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/airsoft_thompson_machine_gun_parts.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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 5560 bytes
SHA-256: a951207284a02b984f0a44375b3ea1c12b641cb10e817fcf29f077d7b40f0b5e
font_01_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 11300 bytes
SHA-256: d0f4b8612d06318e0db13cd4be9ecf3dafc869d700adc14946c1f1b9120c7114

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