Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cd9db0d400ddd9…

MALICIOUS

PDF

75.4 KB Created: 2021-01-16 15:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 62decd430bb0e841c75991f9728a7aa0 SHA-1: 382ccef06721aca301dbc2647b78b64655c26cc5 SHA-256: 99cd9db0d400ddd952b3a46259baa39cde17fabb5df518131c20ed447b8e59a1
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or redirection mechanism for phishing or scam content. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the PDF's structure is designed for malicious redirection.

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://trafffe.ru/aws?utm_term=best+guided+meditation+podcast+for+sleep PDF link annotation
    • https://site-1166752.mozfiles.com/files/1166752/jcahpo_osc_study_guide.pdfIn PDF document text
    • https://fevijalefo.weebly.com/uploads/1/3/4/3/134383315/8417897.pdfIn PDF document text
    • https://nugobobunebiset.weebly.com/uploads/1/3/5/3/135303429/nilosenanuwa-xibawikitixa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489240/normal_5ffe79c6a0269.pdfIn PDF document text
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/nefatesoxeta.pdfIn PDF document text
    • https://lokuzovitopoz.weebly.com/uploads/1/3/4/8/134871506/9d9a4c6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409122/normal_5f9d928005b03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379035/normal_5f976cf67cd84.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/sFihN4n/97265687700.pdfIn PDF document text
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/4255986.pdfIn PDF document text
    • https://site-1255919.mozfiles.com/files/1255919/momipuvelebudidukuki.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_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 5524 bytes
SHA-256: be3a5c6b41a318bf4a66369652836d7de9757907f79de0c740827c8c7220cc91
font_01_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 10396 bytes
SHA-256: fa2a1c212bb7bc0659899e6a2e70658261545c48c737165674026d2972021b63

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