Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c068b87854cc6a5…

MALICIOUS

PDF

85.4 KB Created: 2021-05-30 04:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 185757e2ba1b26f998f2401eccfdb7b3 SHA-1: 940931c08975bf8208b4a3a800bbc3b9bd2ca98d SHA-256: 5c068b87854cc6a53a27e27fb96a46fdf4119cc7a2cae90882f3aaf3e7983db1
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=ap+lit+question+3+prompts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481990/normal_5feb7f5d057aa.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/7a6ba26648db2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387417/normal_6001e26f3479c.pdfIn PDF document text
    • https://dugilosokufaku.weebly.com/uploads/1/3/4/6/134610324/20203b.pdfIn PDF document text
    • https://taponoranasigem.weebly.com/uploads/1/3/4/6/134643922/xokasebi-wofuvosaluwim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_600c45a48cb68.pdfIn PDF document text
    • https://nufirejibojo.weebly.com/uploads/1/3/4/6/134645492/nufamo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5fc8fdea06655.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/senoxapuwijavidilojo.pdfIn PDF document text
    • https://vizudenorip.weebly.com/uploads/1/3/4/6/134674315/8422635.pdfIn PDF document text
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/polibox.pdfIn PDF document text
    • https://magaxopix.weebly.com/uploads/1/3/4/6/134647228/suveguwixuz-biwur-muwefid-bodixoxezimi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456393/normal_5ff098178faa3.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/0cdd43ab-7cf2-4b1e-8864-19f204cdf242/livepafivemek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e81e5912-04bf-4dd1-9ad6-19b89e7f89ab/baxijulozesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39eff4fc-201e-4c67-8327-f925b03cdba5/5666896389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea4b6ce-052a-41e4-973b-47cd0128beb4/18191916141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa56f1e-37a3-45ba-acf5-78e6ccfa4f78/45967778933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e601da9-49a3-4061-9c08-6c2a35748bcf/54454801811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656aa529-aec8-4529-b7ba-0cbc849218da/16558102986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a5dd23-1acb-458a-b7e4-76891c33c5f6/16493392599.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_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 5032 bytes
SHA-256: e7835b391ebc63f447eda6547e0b66f81d1d229b0d21384e47952f880bca16ef
font_01_sfnt_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 10620 bytes
SHA-256: bcc1ede19b03aaa838f4bd148c0d719c425c49572268d2df3706720b5f388b31

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