Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ddd2ee24c68192…

MALICIOUS

PDF

73.1 KB Created: 2020-11-25 19:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1dcfb411559deec5cb0f82ed420e730f SHA-1: 3e00d32c3b33ba5d236f5479c7b1dfa4eff3babe SHA-256: 83ddd2ee24c68192049753a25a5a02fb27c9ece1692841372a4ac71bc1258cde
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme designed to lead users to malicious sites. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely serves as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/aws?utm_term=doctor+gradus+ad+parnassum+debussy+sheet+music In PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/c579371.pdfIn PDF document text
    • https://dezusopivelisuk.weebly.com/uploads/1/3/4/7/134734284/wesulera.pdfIn PDF document text
    • https://tuwikoli.weebly.com/uploads/1/3/4/3/134312541/8901085.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/sugaguxagu/school_district_170_employment.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/sairat_movie_naa_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fb0414-897d-4e4c-b5bb-59a0271e68ae/carlmont_bell_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/formation_continue_ergothrapeute_rennes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd55cec-683d-40e4-bb26-44c68cfade92/class_4_weapons_purge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04dc50f8-061c-4fb2-bdac-12a001831ad1/alliance_flight_path_badlands_vanilla_wow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19dfc150-07a9-4adf-bbcd-0246c0c5f989/neerarum_kadaludutha_mp3_free_downlo.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/2017_kia_sedona_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76E 5696 bytes
SHA-256: 9390f5f32514d7971d20d765be11f77403eb569a3fea55b789dc0a9b0ed5c788
font_01_sfnt_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 2060 bytes
SHA-256: f93542dbf11e1b78b0e03947724839818dd350ad06a5f6d49fbf9462215d74ee
font_02_sfnt_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 14200 bytes
SHA-256: 63795f9243947a9717ad5d2a16640c29e78075fb24b137b5fb48b9ffc345e8ae
font_03_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 16184 bytes
SHA-256: f0d7227652c39c0ed3a674eb50801baccdef2bbf27cbfcf74ce440b78e632b52

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