Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b04d9874388933d…

MALICIOUS

PDF

69.3 KB Created: 2020-12-26 02:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9545703e8427d5aff11b0e45c3a8e698 SHA-1: bea06473a0ba2f29620f5dd040a13211d8afa1b7 SHA-256: 4b04d9874388933d1dcf35b6dee802104f71a3e91c0ec14936e6ce7a5bc5904d
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain text related to movie characters, suggesting a lure to disguise the malicious links.

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
  • 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://gettraff.ru/strik?utm_term=clue+movie+characters+costumes In PDF document text
    • https://nukokefefaselug.weebly.com/uploads/1/3/4/8/134874449/8b2cce1c5473.pdfIn PDF document text
    • https://nodararikerat.weebly.com/uploads/1/3/4/8/134885074/826902.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376358/normal_5fe20cc26799e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/24195938802.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/47305663183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2536e1-3444-4437-b9f1-a476a4e6f58c/theta_emerald_ex_evolutions.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/57631873362.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/video_4k_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/mouth_of_the_river_def.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/11950604544.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_off0000d362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 5004 bytes
SHA-256: 83f6d592afbd0da8a4d435ebf45f38031f200ab8f8b426a7b603f23ce263fdfe
font_01_sfnt_off0000e433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 10676 bytes
SHA-256: a0f0e6cc55c98fcbfe5153990ee95f5a091a10db09a859e80f72f8a73ca7de98

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