Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8343413d5f2fcac…

MALICIOUS

PDF

101.3 KB Created: 2020-12-28 16:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 554ad1d4d61bc93d0647aa75cf173aa8 SHA-1: 64f56c806f0a892e39269c1cb1cf0861b7653e54 SHA-256: f8343413d5f2fcaccff82d7c92cd31f997f6e023b41ca2e02f507a73bb5840bf
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful websites.

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://trafficel.ru/strik?utm_term=2020+nfl+fantasy+football+rankings+non+ppr PDF link annotation
    • https://cdn.sqhk.co/pimidima/oQAPFii/6995461894.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/U2bqiaJ/fuzazawodijedodevez.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/jixidused.pdfIn PDF document text
    • https://nisutezobeta.weebly.com/uploads/1/3/4/4/134486685/5543276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f8bd63ebefe2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5fce7d2251be5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5fa96105af50b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f8e25e87bcf7.pdfIn PDF document text
    • https://virubavu.weebly.com/uploads/1/3/4/7/134755547/a2aded5c8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/48f65040-c2bb-4d6c-beec-064dd164f09e/malavupezudanivuzusabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249d9469-b22e-4dc9-ab38-068c5c475f87/zepakafutiwitovula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece7ce5d-bc19-4a77-aa61-48723adfdee2/computer_integrated_manufacturing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e16d202-b421-477a-9c85-074724ad37be/poema_bebiendo_coca_contigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ab49a9-c77a-4906-8cdf-3d8cd6774786/kufileluzusexiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8308c8c0-ded3-4541-8752-e4681def15ea/zebag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3A 5224 bytes
SHA-256: d78cb2362a766766d5af23c58bd2cc0d552343d3ed0f31504622875b7fc26d1d
font_01_sfnt_off000150ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FF 12068 bytes
SHA-256: 3f8da29578dc86bff5da67b10ce9d1a0920467615a96169365a43a0c95d95e3b
font_02_sfnt_off000179a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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