Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f555cd20b15b8d…

MALICIOUS

PDF

72.1 KB Created: 2021-01-10 00:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db177fcb9eb09d01952448464c1f43cb SHA-1: ee9e0df72f2d553ce5f4bff51aa3c1c0983fa856 SHA-256: 60f555cd20b15b8dd645d934bd5ac7bd635fca4c2cbaa32fd375c697edd80ab5
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 functions as a link farm, containing numerous external URLs pointing to disposable hosting sites, suggesting it is used to distribute phishing content or further malware. The presence of many external links and the PDF_SEO_LINK_FARM heuristic strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=critical+path+project+management+template
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/pasepavixufevowatose.pdf
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/sexuwu.pdf
    • https://lonamejekewow.weebly.com/uploads/1/3/5/3/135396766/92bfc39.pdf
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/5446636.pdf
    • https://dedezeke.weebly.com/uploads/1/3/4/4/134494225/juxakikumuxevi.pdf
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/9916516.pdf
    • https://toxutumopomepe.weebly.com/uploads/1/3/5/3/135327812/8750945.pdf
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/8f848537e.pdf
    • https://wuxuburivoviw.weebly.com/uploads/1/3/4/6/134633524/zomexe.pdf
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5fc1cac354798.pdf
    • https://cdn-cms.f-static.net/uploads/4427085/normal_5fb2bd7b205c8.pdf
    • https://cdn.sqhk.co/joxipadij/gggajbU/26489929652.pdf
    • https://garisufusomepis.weebly.com/uploads/1/3/0/7/130740000/9772990.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000de4e.bin
9eb0fc22c51b2a2eed39393e728de11cbaeacdfda0818c6b4f3a002508c349a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 5152 bytes
font_01_sfnt_off0000efa6.bin
a9307f080657dc856df0cb02298bb823c7d21942c6c4ce95c2bf6c85905b0720		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 10652 bytes

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