Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab67f3f24c336aa…

MALICIOUS

PDF

98.1 KB Created: 2021-02-13 16:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 48d61af23d0206779ecada83ce3548f5 SHA-1: 26f94c4bd11f027944140cb7b06b8580c3172856 SHA-256: dab67f3f24c336aabbae0b827bef23d688488d343e2cb3060ee3e7b96ea1221e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/123?utm_term=hip+pressure+cooking PDF link annotation
    • https://cdn.sqhk.co/lebereme/PHgfPjd/movistar_colombia_internet_y_television.pdfIn PDF document text
    • http://zefupubodagome.22web.org/tutixadolozog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5fd3cac73796a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454678/normal_5fcb3109798a3.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/2zmGbjb/tie_dye_patterns_starburst.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_600e688cad0b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5fd1232b2f50a.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/giVI4ic/bomb_squad_mods_file_download.pdfIn PDF document text
    • http://pimupafigofud.iblogger.org/fiworodebixosigulu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463528/normal_600295bea2018.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/dNjjphb/teaching_strategies_gold_member_sign_in_my_account.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382003/normal_60009ee1606a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493549/normal_5fe2251a99352.pdfIn PDF document text
    • http://zalofamanaw.22web.org/81638182639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vipodozuwuwo.epizy.com/fimokebabaj.pdfIn PDF document text
    • http://jezagap.epizy.com/best_free_mailchimp_newsletter_templates.pdfIn PDF document text
    • http://mapupove.rf.gd/90071816759.pdfIn PDF document text
    • http://sazojojuw.rf.gd/kofisosoxafulelokuru.pdfIn PDF document text
    • http://zawofepak.epizy.com/belleville_spring_washers.pdfIn PDF document text
    • http://bavabime.rf.gd/rebojejenufozerikevi.pdfIn PDF document text
    • http://sawutekoxa.epizy.com/android_listview_arrayadapter_filter.pdfIn PDF document text
    • http://diruxepuf.epizy.com/songs_of_war_movie_free.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014b39.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14B39 26564 bytes
SHA-256: 2b3e7a1b2415067875de21b767179be4a1b684231f2d34fc6cfaf37b9817b096
font_00_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 4884 bytes
SHA-256: e0b7caba6a81add74857e89219419858721b853a9d4129a2ba13fd68ca6095a8
font_01_sfnt_off000124a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 11316 bytes
SHA-256: 40e2979c60283162d05fbece360ae82a548d92a2cac000072b6ee544b8d14d50

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