Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef92c1ae16109e8a…

MALICIOUS

PDF

74.3 KB Created: 2021-06-10 17:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec650068faf1339560716dd67bbefd57 SHA-1: db96b0d398f3642b0aeb5477445f2f3ad8997ad4 SHA-256: ef92c1ae16109e8aa0a62d877f142fc5cb57c3166f1ffefa81b17c4fee0c6d03
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to potentially harmful content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-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://allytemp.ru/pbw?utm_term=how+to+make+homemade+slime+without+glue+and+activator
    • https://rigawolazi.weebly.com/uploads/1/3/4/7/134710531/68792acc.pdf
    • https://xozojijeb.weebly.com/uploads/1/3/4/4/134436315/7808071.pdf
    • https://cdn-cms.f-static.net/uploads/4368218/normal_601f00c83326d.pdf
    • https://rotufufuzefido.weebly.com/uploads/1/3/4/9/134901673/f9e2d5290d93.pdf
    • https://rotedovifiwi.weebly.com/uploads/1/3/4/8/134846651/4271907.pdf
    • https://static.s123-cdn-static.com/uploads/4366976/normal_5fe592eca36ca.pdf
    • https://rivagusej.weebly.com/uploads/1/3/4/2/134266472/zapevuwem_polij_vupoxawajudos.pdf
    • https://cdn-cms.f-static.net/uploads/4416494/normal_60189fc917bbe.pdf
    • https://lajejajutabi.weebly.com/uploads/1/3/6/0/136050508/numunadojeboseb.pdf
    • https://vakurizilobiwil.weebly.com/uploads/1/3/0/9/130969742/1a466d3eb596fd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bovozajezo.pbworks.com/f/pezepozewaxamimebesawizem.pdf
    • http://paditoxef.pbworks.com/f/17659020080.pdf
    • https://uploads.strikinglycdn.com/files/2d5fd4d8-32c2-4685-832d-5a9ed69cc440/perepefizinib.pdf
    • http://jizakatum.pbworks.com/f/fanumavu.pdf
    • http://jalosozamiz.pbworks.com/w/file/fetch/144722289/vakotamobikegaxiwozuwux.pdf
    • http://ziludezubeju.pbworks.com/f/firupajebotepomuga.pdf
    • http://pebokuvog.pbworks.com/w/file/fetch/144704442/71967145980.pdf
    • https://uploads.strikinglycdn.com/files/5fc51f2a-d6a3-4788-8896-088181d1891c/30867444668.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_off0000e565.bin
7f56496e314d0dc0a0682f2388816b049f5a3c3f7a9a9b6181f322a4f5fd320b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 5532 bytes
font_01_sfnt_off0000f81a.bin
64a8ee5cdda746daa5708b57906f9319e4fc02073b058cb8922c6758b8b6668f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 10372 bytes

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