Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5e38cf6a9cdc52…

MALICIOUS

PDF

71.2 KB Created: 2020-11-13 15:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4ad71a2263691742d0bcbc656c7e56c7 SHA-1: 9a6f24aa8b08e237653c46b5cd15535170996a37 SHA-256: 0b5e38cf6a9cdc5237c91f8e64e373830271e669f40e8e50af8c9c811c1099c7
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to popular media, suggesting a lure to entice users to click on the malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=watch+romeo+and+juliet+1996+free In PDF document text
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/gewoburirukojidakode.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/f670a2be-aa3d-454d-8e38-deea5f754803/jotomojav.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/44397355731.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/legally_blonde_the_musical_paulette_monologue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43e3ada-e9fa-49a4-8b46-15e27ad7db44/ladonixajubosumefusulekex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf60e430-4922-4c9a-8808-be474d60c459/guvunoxopat.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/cliche_lyrics_todd_rundgren.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/birivow.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/19556173997.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/vuwopi.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/precalculus_functions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/33805815946.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/godamorofavesup.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/epsom_salts_bath_for_dogs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d947eed9-2d10-440a-9b84-319694b3cc87/12867719344.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/definition_of_job_analysis.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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 5536 bytes
SHA-256: 1a48e9673ad32a03eaf208fb3dccd746931d827403cc5fdd5aec3af1ba595e93
font_01_sfnt_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 10144 bytes
SHA-256: 069550ef6818dc48d7526e3e9c32931e2e444c37d413522c32d3c15405964aab

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