Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f4d44f9dfed75a…

MALICIOUS

PDF

71.8 KB Created: 2021-04-28 11:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d6321acd817d9351b06b1e8b7dee089 SHA-1: 505e19f0a21d78316523b08c54b4421c7586b451 SHA-256: 22f4d44f9dfed75a13a1a3bad02536b27717ee603e7765d67df4b2710e906ae7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://pelibifir.ru/strik?utm_term=how+to+write+copy+for+social+media
    • https://kapupigabila.weebly.com/uploads/1/3/4/7/134729593/netajonur-bokizerebozufot-xekezupik.pdf
    • https://sowotelimavo.weebly.com/uploads/1/3/4/0/134000290/1b3520f1606ed.pdf
    • http://copyrightsupporteds.com/70221575259mvvrn.pdf
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/8a671ea.pdf
    • http://appletopshop.ru/xevakugagaludewnymc9.pdf
    • https://cdn-cms.f-static.net/uploads/4392664/normal_606a30ce88be4.pdf
    • https://cdn-cms.f-static.net/uploads/4453741/normal_6039811287621.pdf
    • https://cdn-cms.f-static.net/uploads/4453327/normal_5fe82a7214978.pdf
    • http://mitatizizuje.mypressonline.com/fosizuf.pdf
    • https://xasizati.weebly.com/uploads/1/3/5/9/135978204/sowudaligi.pdf
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/sagewig_pewowofefebem.pdf
    • https://cdn-cms.f-static.net/uploads/4459188/normal_600bfb046fa7a.pdf
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/3d9606d.pdf
    • http://paxenazubenib.mygamesonline.org/explain_the_three_estates_of_france_class_9.pdf
    • https://komamizidunip.weebly.com/uploads/1/3/1/4/131437982/tejuborevejis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/divikufifir/invitation_template_email_free.pdf
    • https://s3.amazonaws.com/tikoweravisixu/business_presentation_format_ppt.pdf
    • http://zisukuvi.atwebpages.com/business_environment.pdf
    • https://s3.amazonaws.com/jozaponi/66369008935.pdf
    • https://s3.amazonaws.com/dalava/renewable_and_nonrenewable_resources_worksheets_5th_grade.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_off0000dca9.bin
e9ef606384fd1a6d2bbeb59cc547971516da08b2f6e5d7524b7a2dd8fc9675b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 5456 bytes
font_01_sfnt_off0000ef3d.bin
a60e43b9933ebf7a9cd67605bc130dc00bf634f1f4eccd53277f714dc0903256		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 10104 bytes

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