Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad97ee52abe3abbf…

MALICIOUS

PDF

66.7 KB Created: 2021-02-24 16:26:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 73bea8879682fef6f50e6adf6688e7d4 SHA-1: dc5045fc22b93a90e6860961389e8bdd13d0685e SHA-256: ad97ee52abe3abbfbe01d83ee036a709eaaae5f6653ad32f8fbaed23ee92658a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search queries, directing users to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=what+is+a+good+lexile+score+for+a+10th+grader PDF link annotation
    • http://instapodarok.site/gekunedowozistohg.pdfIn PDF document text
    • http://arm-watch3.club/wiriv5eu8o.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/hathiii/bullet_bike_hd_wallpaper_for_pc.pdfIn PDF document text
    • http://nasporte1.fun/draw_tite_activator_3_troubleshootingh9dks.pdfIn PDF document text
    • http://fewizoge.22web.org/what_happens_to_the_baudelaire_orphans_in_the_end.pdfIn PDF document text
    • http://vinorama.fun/homeostasis_worksheet_pearland_isd_answersk6z02.pdfIn PDF document text
    • https://cdn.sqhk.co/gagowuname/ihf7dxz/4251430673.pdfIn PDF document text
    • http://energytik.net/jegavemuzafipegu1qcq.pdfIn PDF document text
    • https://cdn.sqhk.co/gopefovepagi/bhahd6T/35055396914.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/can_a_cracked_heat_exchanger_be_dangerous.pdfIn PDF document text
    • http://instasurprise.online/sao_swordland_mp3_downloadrcjts.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/hhifPic/wisepay_app_login.pdfIn PDF document text
    • http://terugate.mypressonline.com/kosivawitakowofib.pdfIn PDF document text
    • http://ohota-ribalka.online/56845863394xsbpb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gexaforagugozen.rf.gd/ayat_al_ruqyah.pdfIn PDF document text
    • http://bajivuselome.epizy.com/bible_by_life_church_apk.pdfIn PDF document text
    • http://javamav.rf.gd/hikvision_camera_default_password_not_working.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_off0000c737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC737 5560 bytes
SHA-256: dd47f0c31a906cbeac11fa9587346b89bcd96da5457869da4e59aaee94718f4b
font_01_sfnt_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 10400 bytes
SHA-256: c232556474b5b3dfc0ec182ff1f6e1c1ccc52be243048f77b00bb44368bece6c

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