Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bef8637c28188d4…

MALICIOUS

PDF

75.3 KB Created: 2021-03-21 08:32:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5d914ed5a3e941a96f98d4ecab9d1f1f SHA-1: 57b4db674c827a2aa9088f14cd7bcfbb9c233e4d SHA-256: 2bef8637c28188d44a784bc864fd75f4d0951adb19f3e48c21891ed2d29794f6
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/123?utm_term=3dp+net+windows+xp PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4428335/normal_5fc5be4b8204e.pdfIn PDF document text
    • http://sidazolomaw.22web.org/92851542953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475861/normal_604bb97486fc3.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/fheijjc/real_chess_game_app_free_download.pdfIn PDF document text
    • https://buniburus.weebly.com/uploads/1/3/1/6/131637527/94437f.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/jjhcKgi/making_rope_binding_guitar.pdfIn PDF document text
    • http://batezelokev.iblogger.org/jibirusedarodabade.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/cijggqi/superzings_hero_truck_monster_roller.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_602ea4be84959.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/fjhhesb/65171837892.pdfIn PDF document text
    • https://famuvotatag.weebly.com/uploads/1/3/0/8/130813835/8a928273133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_600e404238d2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475380/normal_60063af3d0b04.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/WgghcJO/inspirational_stories_for_teens.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/carpentaria_shire_council_road_condition_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/apache_maven_compiler_plugin.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/juxubobofesizitene.pdfIn PDF document text
    • http://kewoxorewozox.rf.gd/riresez.pdfIn PDF document text
    • http://meganisaniwo.rf.gd/bulazivolubu.pdfIn PDF document text
    • http://wurozuvejesubot.epizy.com/bifekulilasudate.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/how_long_to_cook_chilli_in_a_slow_cooker_on_high.pdfIn PDF document text
    • http://zebekebagen.epizy.com/iq_test_questions_with_answers_in_english_download.pdfIn PDF document text
    • http://zirivog.rf.gd/10220162990.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_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 4844 bytes
SHA-256: 2d641d572f5544fda2b66e56fc759642a4ca2219aa738b77e38348c7da2bd610
font_01_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 10724 bytes
SHA-256: 7c34925b49cb9e591ba010116e0ac9bfa02d717c65536511f50e7f3a77d302d2

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