Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b32c94646dd9eb…

MALICIOUS

PDF

66.5 KB Created: 2020-12-02 13:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c4495ac2277d6788167eebd84c80e04a SHA-1: 92b354490a2be9ce44ea10813a46f120deba16f9 SHA-256: f3b32c94646dd9eb04fd3f9fcc1694b9049d6e02524c43115080b91f99fd00aa
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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/123?utm_term=troy+bilt+2800+power+washer+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f870189a682f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459479/normal_5fa996b3365f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_5f8a9fddceb98.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/ed83d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_5f9414a046635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f9064cb51003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0dbf0116eb00e3c4bba69/t/5fc1841abc819f1cf4123143/1606517786758/el_bola_analisis.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3696f7848ba205d2893e8/t/5fc3f316f81c9a2a0c1c218a/1606677272339/lawyers_diary_and_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/catheter-_associated_urinary_tract_infection_idsa_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58974b66-4deb-4654-81ae-2aa5d4750f9e/sobiz.pdfIn 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_off0000c64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64E 5660 bytes
SHA-256: 7089cbee30e270ae7a9845aa03217b788f9008409083b627952fe2d6a68c8e59
font_01_sfnt_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 10732 bytes
SHA-256: c1bc655a3ca3b7d9a3b9d39e3e5254ba231dccdf0542dc8e194583bda969b7b7