Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fdcbbcd851e749…

MALICIOUS

PDF

103.0 KB Created: 2020-12-08 17:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e11122f302fd0b9df75ccf9c57f657db SHA-1: b02710dd4738b075ff521e60784b15f6f0c24c62 SHA-256: e9fdcbbcd851e7494edb1d994ab3758748b68ece43521c8db1152f4cd9180dab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://trafffi.ru/wb?keyword=permissive%20reporter%20vs%20mandated%20reporter PDF link annotation
    • https://ninisajata.weebly.com/uploads/1/3/4/8/134869212/ab5b5d48ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fc55b3825fbd.pdfIn PDF document text
    • https://bibatuzasofobi.weebly.com/uploads/1/3/4/8/134879938/1137630.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/5fc52b3ca87939686423ef9f/t/5fc6515b145a8629dc88c0e6/1606832475605/59256084938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd8963f-8521-4b32-a86d-e487749fd3f9/80762217079.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36408403f5353fda5a38e/t/5fc5279f4e98326c02b6bc75/1606756258989/sidi_mountain_bike_shoes_wide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc165e488c99b6d37aa9f7e/t/5fcde7285177ea328ce5666c/1607329576939/sevadofog.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4d9052e537a05ef22535d/t/5fccff815d2e6f3bda3fa80d/1607270274165/ludo_classic_game_free_download_for_pc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d7ac403f5353fd956fc5/t/5fc2aab6f81c9a2a0cf988bb/1606593206200/oak_hill_basketball_alumni.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f79e2e34347c7044618a/t/5fc121e13c6ccf69f3865100/1606492642097/gentle_leader_dog_harness_how_to_put_on.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b63bab79f442f228a4c9/t/5fc602fefa04221c71ee935e/1606812416449/lilo_and_stitch_cousin_625.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14287 5132 bytes
SHA-256: 3ad2251e2a72d185a127658009436a454ed373ef05cfed42f8b4ab23ded9667c
font_01_sfnt_off000153eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153EB 11084 bytes
SHA-256: 769d06a419d1e83d0d17de69359b0834c49a2e70b772297c352b6a566c213f45
font_02_sfnt_off000179c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179C2 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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