Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23e458b37aba1e1…

MALICIOUS

PDF

79.7 KB Created: 2021-02-02 07:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5d4b619ca8a9235dc04e57a7a3675a4a SHA-1: 67cca1403bae0940568626b6625e2458210c5c23 SHA-256: e23e458b37aba1e1910e549d8eb85efc05bcbf847ec69a6b4c4304ae672d82d6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm. The document body, though heavily obfuscated, suggests a lure related to a 'school farewell speech'. The presence of multiple external URLs, including those hosted on Weebly and Cloudflare, indicates an attempt to redirect users to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

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
  • 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://maypoin.ru/123?utm_term=school+farewell+speech PDF link annotation
    • http://limaxinsto.xyz/simple_to_do_list_template_excelfq52q.pdfIn PDF document text
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/0ef348c21d7154.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/mMVgeoC/history_of_ancient_southern_african_civilizations.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/iJihhaL/ninegasuz.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/fAvckhL/endress_hauser_devicecare_sfe100_download.pdfIn PDF document text
    • https://lolejubabam.weebly.com/uploads/1/3/1/3/131379737/zuxaxilolimopigedigi.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/GidDPvL/viwizilawovasenemapi.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/Zk7geZh/mewon.pdfIn PDF document text
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/6661626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vedexajawo/nanakapujuje.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/galaxy_defense_strategy_game_mod_apk.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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 4852 bytes
SHA-256: 05b5840ab74f9faa6ac9dcd067bf121e5bf727d266e6e80e16312c3c79feb27c
font_01_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 10332 bytes
SHA-256: 6004587eb7389dce6b3de48fda8b0bd6034035633c85417539c70d4fcbe26b1a
font_02_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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