Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b0c2024d202736…

MALICIOUS

PDF

81.1 KB Created: 2021-03-14 03:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ff974fc58f32503bb6757f0afc36cd88 SHA-1: 5b17e7c0a5ed7905633cbe50efc500be700d9ec3 SHA-256: 33b0c2024d202736b5737fc1cbd481390ab3a70792cfde432958e868d550d038
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. One prominent URL, 'https://resalured.ru/123?utm_term=boarding+card+wizz+air', suggests a lure related to travel or flight information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, reinforcing the phishing or malicious download intent. No scripts were extracted, but the overall structure and embedded URLs point to a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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/123?utm_term=boarding+card+wizz+air PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467322/normal_602699a098d1f.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/QpUjhih/miwazi.pdfIn PDF document text
    • http://academic-club.ru/67185463360tfvjt.pdfIn PDF document text
    • https://cdn.sqhk.co/mesafovojifo/A1PCiiF/46571883778.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/g7RJgeK/microgolf_kuisen_soda.pdfIn PDF document text
    • https://cdn.sqhk.co/wirumedaba/0oDWBz5/special_warfare_combatant-_craft_crewman_training.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_6025de73c584b.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/yjOhfui/vosavupug.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/ifihOYZ/tor_browser_download_linux_64.pdfIn PDF document text
    • http://beach-fruit.fun/wulenajadarzkvdq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487197/normal_5fc9dfc767f3e.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/dRnaGgf/jivesobumizaxalese.pdfIn PDF document text
    • http://azules.ru/202125642824uxbh.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/O4hgIhj/best_twitter_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/ohcigjb/house_music_fm_radio_stations_london.pdfIn PDF document text
    • http://vebofituzor.iblogger.org/ieee_12207_srs_template.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/114bacdc-10ee-4ca4-b639-c1c1a951494d/element_elefw328_remote_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbbde1f3-089a-4c64-ae67-0e2c197e5cda/34918606687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7daaa07c-7d6d-4f94-ad3c-93906371ed1c/46253832542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e62740e1-9806-4130-8f54-bb5b82a27906/gozasivumoxijitumomowir.pdfIn PDF document text
    • http://webubekesivamuf.epizy.com/4603060798.pdfIn PDF document text
    • http://vobuxex.epizy.com/48763185688.pdfIn PDF document text
    • http://zubafazebet.epizy.com/dumeranikumasobuf.pdfIn PDF document text
    • http://lozufoxozaniso.rf.gd/bloody_bones_anita_blake.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_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 5088 bytes
SHA-256: 41bd5452bf8c0a81aec55ef29fca6887f11d66b6afda1ab66370b22bb782c8b9
font_01_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 11252 bytes
SHA-256: e57ab61f5a9dbed67c61fcdd011f5c294a148d6cd9b214dcb4b843815a0829ab

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