Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c76ceabd4ce536a…

MALICIOUS

PDF

71.2 KB Created: 2020-12-21 03:13:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a67050b3fdcfb26e69f1cb0d76959cfd SHA-1: 54b7acca54aa5864cbf1a252f4f5efd309225231 SHA-256: 5c76ceabd4ce536ae47e682563de42339e70109bbb234eba07736b7e2b1e3802
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains strings related to 'cobra 29 wx nw st power cord' and 'wkhtmltopdf', suggesting a potential lure or exploit context. The presence of multiple distinct hosts and disposable domains in the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=cobra+29+wx+nw+st+power+cord
    • https://cdn-cms.f-static.net/uploads/4424007/normal_5fbad8eb76fba.pdf
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5f932da01736e.pdf
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/6ef3da0833ee2cd.pdf
    • https://dajapofijakaf.weebly.com/uploads/1/3/4/2/134266914/pegoxam.pdf
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/b443c.pdf
    • https://nonefipuxope.weebly.com/uploads/1/3/4/4/134493331/serukobetebi-xujadonak-viramug.pdf
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/2457481.pdf
    • https://devanuwi.weebly.com/uploads/1/3/0/9/130969177/nalazogomo-woduwubini-sosijobanumovo-mebadalowo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/paropabaru/xerafowoguwubuzojepab.pdf
    • https://s3.amazonaws.com/tetazino/fanfiction_loud_house_storm.pdf
    • https://s3.amazonaws.com/woxojuxafopuv/5802476296.pdf
    • https://uploads.strikinglycdn.com/files/3d55afc2-b4b0-43a4-b1c6-b0d9f535c5c9/mpusd_school_lunch.pdf
    • 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_off0000d7cd.bin
d0fa17461bafa0a65b9bc0bff674e6c0d48ffd178983dadf003840d804067183		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 5528 bytes
font_01_sfnt_off0000eaad.bin
2be69a1ece08f4fb0a9b07a4acc25259b06043b8fd598a0f118ed21d71f33425		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 10868 bytes

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