Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23d9ebf5aacd175…

MALICIOUS

PDF

72.3 KB Created: 2021-03-17 02:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3d6631aa1c403f47f92138374bdd387a SHA-1: 1b1a4e9ea4b7df811f6a878e17c2973acfdd3446 SHA-256: e23d9ebf5aacd175d43ede6122208902f36f19a469a733ac548fff875cb7c8b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=adobe+xd+android+tablet+ui+kit PDF link annotation
    • http://snatural.space/wotaporajebibmjw1.pdfIn PDF document text
    • http://leadtop.co/32183083984oyukd.pdfIn PDF document text
    • http://luvetikemo.66ghz.com/53629446717.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/bromatologie_animale.pdfIn PDF document text
    • http://nickned.me/simple_past_worksheets_exercisessofzg.pdfIn PDF document text
    • http://wownatural.fun/816825692870bxw5.pdfIn PDF document text
    • http://ruboperuba.iblogger.org/nazikiwofuji.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/77162298748.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/10238179722wbl6o.pdfIn PDF document text
    • http://reweder.site/primal_blueprint_fitness140h3.pdfIn PDF document text
    • http://fotogodopuxet.iblogger.org/zigulewasokowuza.pdfIn PDF document text
    • http://discount50.pro/44481114627brd6j.pdfIn PDF document text
    • http://kafofal.mygamesonline.org/tuvozagafewikelexeku.pdfIn PDF document text
    • http://moreprodukti.com/tufebepepitasamimih8gm8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://momosetid.rf.gd/muzexijilev.pdfIn PDF document text
    • http://zotibulavozixu.rf.gd/my_asus_app_windows_10.pdfIn PDF document text
    • http://gepikadagutuv.epizy.com/anorexia_unam.pdfIn PDF document text
    • http://xunonevikonog.rf.gd/new_european_guidelines_for_cerebral_venous_thrombosis.pdfIn PDF document text
    • http://gewapapis.epizy.com/minions_movie_2015_full_movie.pdfIn PDF document text
    • http://wubonaxe.epizy.com/finance_business_analyst_interview_questions_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 4784 bytes
SHA-256: d194fb0e35a32b45dc8b558277474448be3972472617efb272769fd9f6bae0d8
font_01_sfnt_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 10396 bytes
SHA-256: 4cd93940bf87864b0fc4655409ee3a26a6e6cd3724ac5fcc9f61fb4a88be643f
font_02_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361