Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fada3172a4c878c…

MALICIOUS

PDF

78.6 KB Created: 2021-04-04 19:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5c15d4d2203704c3bc99abbf9fa0c928 SHA-1: 95d9ba357fecfd490312161d5c237a49a445883e SHA-256: 6fada3172a4c878c1519faa25e0b016b2da891551c34667a1bd704490b3f5ef5
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the malicious intent by using multiple domains for SEO purposes, likely to trick users searching for free downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/award?keyword=analytical+reasoning+pdf+free+download PDF link annotation
    • http://vuzetasavuxoso.mygamesonline.org/what_is_error_code_b200_on_canon_mx922.pdfIn PDF document text
    • http://dalnoboyi.xyz/93788780455dxtjh.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/ihaheeX/30_day_eviction_notice_template.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/hhfjfdF/magic_piano_tiles_3_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/hdgdNhb/fm_2019_cheap_wonderkids_strikers.pdfIn PDF document text
    • http://help-verification.com/mazodomage5fuaz.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/iiifdBz/65933962928.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/fgeBjgg/78704096366.pdfIn PDF document text
    • http://leledup.mypressonline.com/ausencia_definicion.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/klCZNi0/xadugetofepatixozififasuk.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/y02Uiga/zitabumotikot.pdfIn PDF document text
    • http://robot3.site/16127440132r93cz.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/ba3314dd-1052-484b-ac29-3904d851c6cd/7298633321.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/desktop_wallpaper_free_autumn.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/binaural_beats_meditation_brain_waves_sleep_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5956de4-6465-4599-b02a-0ea98d3824a9/oxford_english_grammar_course_advanced_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a96189d-504b-4c57-a134-2ff548d3ac55/zepukowopuwesosikojifos.pdfIn PDF document text
    • http://furafep.onlinewebshop.net/sopebuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e2a6a8c-052f-4d99-bb7a-06e23437aae6/how_to_use_stanley_staple_gun_with_nails.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7d2cfc-5ac9-4c92-bfa3-4c0961896724/vobofex.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_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 5504 bytes
SHA-256: 2e9df4bb345bfe0483179a29769dd0ffe022663eb1edec2253eb4f50eb256c10
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 10792 bytes
SHA-256: 5aa17076257d1c356664bbb86c7a137eb06d896d3a073a8372db1632cd2b1ded

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