Malicious PDF — malware analysis report

Static analysis result for SHA-256 980b5afea12e9a1f…

MALICIOUS

PDF

76.1 KB Created: 2021-05-20 15:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e7192777a6228a92f76007edb8d3d67a SHA-1: 52b1a8b62fd25bfe066c54ebc62a7db78271cf93 SHA-256: 980b5afea12e9a1f57ddf278c804030e0a8a0cd5f80378d5531af34eb06ededf
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 0.9996

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://botokaw.ru/strik?utm_term=asperger%2527s+symptoms+checklist+child PDF link annotation
    • https://sukigemanewa.weebly.com/uploads/1/3/2/6/132681928/7616929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_5fd8e9b508048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_60463d7c547d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_60531c1355de9.pdfIn PDF document text
    • https://wivojusifapuju.weebly.com/uploads/1/3/5/3/135327063/rotobuk-kojunow-xobokugoweluvok-titamexidalured.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_60296491c8f7d.pdfIn PDF document text
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/dejevoko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5feb446ded9f9.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/06c49.pdfIn PDF document text
    • https://notuvovezed.weebly.com/uploads/1/3/1/3/131382721/7849752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412158/normal_5ff0817aabdc9.pdfIn PDF document text
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/6456443.pdfIn PDF document text
    • https://tolonatapuxid.weebly.com/uploads/1/3/4/0/134042297/2054925.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/mupobalujov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530578/normal_5fdb3ce0dced5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_600be94d97939.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/wojobub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497658/normal_600a3ff4610fe.pdfIn PDF document text
    • https://gikowotezura.weebly.com/uploads/1/3/4/4/134493608/2080505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489844/normal_601a1ee5eef60.pdfIn PDF document text
    • https://jekugisolidib.weebly.com/uploads/1/3/4/0/134097103/1025242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415065/normal_5fe3618a6c32e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 5468 bytes
SHA-256: 81cfc74e860e01d0e7ca6bc4f7cd1047aebf9f273199b14901bf86cac45aece9
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 10728 bytes
SHA-256: ab143ad8a96b56d335c17048db750a88fae12557245f430b0fe8a7f9a7f5815e

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