Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c3d91a3d25f316…

MALICIOUS

PDF

83.3 KB Created: 2021-02-24 01:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edcf0e2145ef91cfd7f52088b308f9a9 SHA-1: 5a9720276f1f7a0146166cd1f3ed99c7dda880f7 SHA-256: 17c3d91a3d25f316af2f39621b91472c73e4cb0a2c7df083ad447e8109b03b36
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically pointing to 'https://yafferge.ru/123?utm_term=project+management+jobs+salary+in+dubai'. The document's structure and numerous links suggest it functions as a link farm designed to direct users to potentially harmful sites. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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.
  • 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://yafferge.ru/123?utm_term=project+management+jobs+salary+in+dubai
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/d12b7854c6288b2.pdf
    • https://sorolaxubamabu.weebly.com/uploads/1/3/0/7/130739744/e136912e594a.pdf
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/dixewupikoz.pdf
    • https://punulizi.weebly.com/uploads/1/3/5/9/135957491/lemalevusig.pdf
    • https://radinake.weebly.com/uploads/1/3/1/8/131856095/1644798.pdf
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/ribolutapujubi.pdf
    • https://cdn-cms.f-static.net/uploads/4489713/normal_602f189b011de.pdf
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/laxofi-xojikolojipaga-zejogan.pdf
    • https://vifojozajo.weebly.com/uploads/1/3/1/4/131454549/1242579.pdf
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fe4e600bfd42.pdf
    • https://cdn-cms.f-static.net/uploads/4499282/normal_600de7e009585.pdf
    • https://cdn-cms.f-static.net/uploads/4417815/normal_600bd2e25c918.pdf
    • https://cdn.sqhk.co/terasovo/ggggdjb/62606102982.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tometubufimopim/mopom.pdf
    • https://s3.amazonaws.com/rafiralexezol/viwajazib.pdf
    • https://s3.amazonaws.com/bubeto/63528257722.pdf
    • https://s3.amazonaws.com/moduluzuxikari/56103694200.pdf
    • https://s3.amazonaws.com/xezujuxoz/8125982819.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_off000101aa.bin
1317275ea7cc570cc0f7ab92d0fb8375eb41a74534a1b602e44321b3bb61b249		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 5576 bytes
font_01_sfnt_off00011489.bin
6e9a39763ede36d7bf56a47bbd1f1fbdafa620a11ae2311bcf11f563a4fb67bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 13344 bytes

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