Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ef9bf032f3e2e0…

MALICIOUS

PDF

73.5 KB Created: 2021-06-14 04:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ab7e613ddeac15d709817c93533243d SHA-1: d24fd3693a312f7521429069143a16eaebcecd60 SHA-256: 08ef9bf032f3e2e082cb889bc3539dd2ace99e314929d58c9d9ddfcdca3fc199
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://chcial.ru/pbw?utm_term=pdf+to+excel+sheet+converter+free
    • https://cdn-cms.f-static.net/uploads/4412570/normal_6018329a75c76.pdf
    • https://zefubolinela.weebly.com/uploads/1/3/4/3/134318842/add314be4f2129f.pdf
    • https://tupeduwexawagov.weebly.com/uploads/1/3/1/6/131607208/4605661.pdf
    • https://jimazakogise.weebly.com/uploads/1/3/4/6/134612968/eb4148.pdf
    • https://ranepudanaliv.weebly.com/uploads/1/3/4/0/134000181/5598722.pdf
    • https://cdn-cms.f-static.net/uploads/4457876/normal_606ac68613aa2.pdf
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/suzutalekukubuxitef.pdf
    • https://static.s123-cdn-static.com/uploads/4368249/normal_6001e56bb40ff.pdf
    • https://getazaxebu.weebly.com/uploads/1/3/4/8/134866961/a7bac5f.pdf
    • https://rofekituluz.weebly.com/uploads/1/3/2/3/132303072/kirunimerowakupakag.pdf
    • https://temonobulap.weebly.com/uploads/1/3/4/5/134592988/abda853de2.pdf
    • https://jobeluraxofedir.weebly.com/uploads/1/3/4/3/134317239/jezuxidiru.pdf
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5ff11e9f9df0a.pdf
    • https://lunafegosewexik.weebly.com/uploads/1/3/5/3/135351611/5ce85ee.pdf
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/rogazasesem_lokep_retuwewuzepu_fajebu.pdf
    • https://kirejoji.weebly.com/uploads/1/3/1/4/131483098/9689026.pdf
    • https://cdn-cms.f-static.net/uploads/4412388/normal_60c69c06d25ee.pdf
    • https://sopezafenivi.weebly.com/uploads/1/3/0/9/130969371/5856198.pdf
    • https://zetewewab.weebly.com/uploads/1/3/4/4/134479884/5240d51ad0.pdf
    • https://gawupuvuto.weebly.com/uploads/1/3/4/5/134530234/7777413.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b4.bin
da8c71efe0688fdc13217a857348d1d79904f140395c8fc74024fdf1c02f94e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 5028 bytes
font_01_sfnt_off0000f5d8.bin
a514f4aa815847b050f8442f8915d96bb9754579479c36f1015095c8b3042afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 10280 bytes

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