Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa6de8bbf93a594…

MALICIOUS

PDF

67.2 KB Created: 2021-03-04 03:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 51ba2affc15f60a335a768de7c3750b4 SHA-1: a22b7b7f1fa86fda9d6a636437df396f8149db89 SHA-256: 6fa6de8bbf93a594d17a8f18a5405d1753865f6c935b1ddca4eb06291e065c8f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and identified as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

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://midufefew.ru/aws?utm_term=esta+ma%25C3%25B1ana+salimos+a+comprar+las+invitaciones.+1+of+1 PDF link annotation
    • http://faceit.su/hot_wheels_unlimited_game_downloadet1ap.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/Fbhjcjh/rujirujazog.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/hhfhejc/bebadewajalewe.pdfIn PDF document text
    • http://vofufime.mypressonline.com/how_to_replace_thermal_fuse_on_maytag_bravos_dryer.pdfIn PDF document text
    • http://duxeluwezix.iblogger.org/rick_steves_ireland_guidebook.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/eiaGigm/42372239476.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/Mjg8hfI/8320497646.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/fisher__paykel_dd60dcx7_dishdrawer_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/ijjehc1/kick_heroine_ke_photo_download_kare.pdfIn PDF document text
    • http://mujezixebu.22web.org/wazubukogifi.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/idjf5uw/fulavep.pdfIn PDF document text
    • http://kozevajalun.22web.org/is_oracal_651_a_heat_transfer_vinyl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litorow.myartsonline.com/mtv_the_challenge_inferno_2_episode_3.pdfIn PDF document text
    • http://renepipelusibav.rf.gd/soundcloud_apk_offline.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_off0000c46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46F 5476 bytes
SHA-256: dcaef0a57a5246e7991ba1fb777accd46537b913d1ba2b4c9652a4c4372a15d3
font_01_sfnt_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 11820 bytes
SHA-256: fb54f1d724ed0c38cc0ce5c85e59e907d937afd52386995d938590dd999b7b52

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