Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce37a1b0802d903…

MALICIOUS

PDF

69.0 KB Created: 2020-11-22 19:07:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b625f20b7027a6fe4eb6623520b6a1fe SHA-1: 90c1a8b0f4204aab92adfc7329d1a2c5a2d683e1 SHA-256: 0ce37a1b0802d903ed103c09e59e02cde52fbb48c639bb963314d315f7db066d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://trafficel.ru/aws?utm_term=apa+format+blog+no+author PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5f8ff201731e9.pdfIn PDF document text
    • https://jirunemopisitex.weebly.com/uploads/1/3/4/3/134332051/525062.pdfIn PDF document text
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/ninokunisixikepere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5f9838a6f34eb.pdfIn PDF document text
    • https://nisutezobeta.weebly.com/uploads/1/3/4/4/134486685/jerotib.pdfIn PDF document text
    • https://kolapudavuvoxe.weebly.com/uploads/1/3/4/3/134315715/6557496.pdfIn PDF document text
    • https://wazuwivanesigov.weebly.com/uploads/1/3/4/4/134431766/6822216.pdfIn PDF document text
    • https://kozipizifepawu.weebly.com/uploads/1/3/4/6/134631686/5816169.pdfIn PDF document text
    • https://dajapofijakaf.weebly.com/uploads/1/3/4/2/134266914/luvub-fofimeb-folij-negoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5fa2479265d1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_5f8907e7a583a.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_off0000d38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38C 5264 bytes
SHA-256: b89711cf137593a9428ab4dd85d67bedf67bd6b3ca58aced237732977f1a498c
font_01_sfnt_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 9892 bytes
SHA-256: 69ad39ca8a5b945eb542677c92911191a619c77d88715e5de6aa08730ca0578d

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