Malicious PDF — malware analysis report

Static analysis result for SHA-256 39954e8bb3d7a647…

MALICIOUS

PDF

69.1 KB Created: 2020-11-11 11:59:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9c3db274621d0996dd068aeb71f9b25e SHA-1: d8c2dc489a21240b9824a765ffaca5b9a7e2416d SHA-256: 39954e8bb3d7a6472e41aec9d6843de77009aa7817d6e95913119c3f41e4cd09
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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?keyword=basketball+legend+unblocked+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374207/normal_5f91480791126.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/wulijubadowelax-gunimememototu-modesugekoxeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417118/normal_5fab601394ac2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3237714-7402-45fc-aa8d-2f2076b86ce4/purulotobojitovewexafifoj.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/shri_hanuman_chalisa_telugu_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/76324596345.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/29328856432.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/92560420832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e399f392-40ab-4f7c-96f9-8ea3a847ec52/siwedixapobixinozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/771518a7-64ab-4771-ad75-9303fca7c80e/29796453336.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/autocad_civil_3d_2018_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4615132e-bb78-4dee-9092-43262c6d5efb/messy_nessy_chile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d57f678-19fb-4100-942f-41d2089305b4/81559566018.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_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 5416 bytes
SHA-256: 1766075971a6079029912940cfed28b9bd904b026429edfbdc0101dcf73cc457
font_01_sfnt_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 10580 bytes
SHA-256: 330ce5cf0f8530ac23ecd564c42b43dde906c8929dc66234b3a4c4ca1b212934

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