Malicious PDF — malware analysis report

Static analysis result for SHA-256 c829698b37c0a23b…

MALICIOUS

PDF

82.3 KB Created: 2021-03-01 18:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7c5df6ec95aee787530ec38c625f1471 SHA-1: 4a1599bde2a238af5ed130441c96608386443a8c SHA-256: c829698b37c0a23b205c17dc582c49c3803b6e7da61c24504186faf919d881c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's part of a phishing campaign aiming to trick users into downloading further malicious payloads.

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 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://druttle.ru/award?keyword=libros+de+fisica+general+para+bachillerato+pdf PDF link annotation
    • http://arendaavto.taxi/crayola_scribble_scrubbie_pets_apphv75o.pdfIn PDF document text
    • http://itdomen.fun/10822188120gt7gx.pdfIn PDF document text
    • http://vitalia-transports.com/zilumonuvanokupak4yb0y.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/sole_f80_weight_capacity.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_5fd10bf0764bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_6007458d4093a.pdfIn PDF document text
    • http://povatunu.iblogger.org/roadside_picnic_movie_stalker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491450/normal_602165ab41a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490364/normal_603113c90c08b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5ffc865837771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_600b4ad7ea305.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/92685640342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_60265c652e8e1.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
    • http://siwojanapav.epizy.com/ditodozu.pdfIn PDF document text
    • http://nomijedelalevi.rf.gd/feneguvixudow.pdfIn PDF document text
    • http://nokarox.rf.gd/54664064246.pdfIn PDF document text
    • http://giwimev.rf.gd/28813902941.pdfIn PDF document text
    • http://vikenigekewojo.epizy.com/teribinuloxija.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 5284 bytes
SHA-256: d4bfdc0a860563f1504e3907f0736f16445741607e4315178e946891ca322b7f
font_01_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 11828 bytes
SHA-256: 6c44660a5134881f0add42e2f90237f03c592d27a43d1c54ab4243a1ee66a9ef
font_02_sfnt_off00012b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B85 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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