Malicious PDF — malware analysis report

Static analysis result for SHA-256 767631a36b606dfa…

MALICIOUS

PDF

73.7 KB Created: 2021-03-07 17:26:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9d5dd52b4f0b6968a47809ccbe4d720c SHA-1: daab87ea556ec1bb5e3984ee901bba44462ba357 SHA-256: 767631a36b606dfa2ac32714b1434d59878db17350ad67f580b5047fb990df4c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection for phishing/trojan activity. The embedded URL, 'https://pelibifir.ru/wix?keyword=california+real+estate+practice+exam+pdf', is presented as a real estate practice exam, suggesting a social engineering lure. Although no scripts were explicitly extracted, the PDF structure and URL suggest an attempt to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=california+real+estate+practice+exam+pdf PDF link annotation
    • http://zitojesudesidaj.22web.org/91136531992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_600dfbd20075a.pdfIn PDF document text
    • http://votatiji.22web.org/74805691168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_60246396514a8.pdfIn PDF document text
    • http://zosatus.22web.org/zigilakodoxeveded.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/towutoginadivu/dog_in_invisible_man_movie_2020.pdfIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_3d21064aafb14fdead3f0c2e24a2dc39.pdf?index=trueIn PDF document text
    • http://nezebur.epizy.com/38066365431.pdfIn PDF document text
    • http://xotepugiz.rf.gd/56725530548.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/marksheet_ssc_part_1_2019_karachi_board.pdfIn PDF document text
    • http://dupenodigilezex.rf.gd/how_do_i_change_my_oral_b_toothbrush_head.pdfIn PDF document text
    • http://gadivedu.rf.gd/configurazione_alice_mail_su_tablet_android.pdfIn PDF document text
    • http://wifanomozumof.rf.gd/estudios_de_casos_y_controles_ejemplos.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_962ae29fbb0e445bb75715b58b7bb99c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fipijife/interview_questions_and_answers_for_fresh_graduates.pdfIn PDF document text
    • http://diverozisutujew.epizy.com/basixibavekufof.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/fivometawe.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/fifufuvupojebakixaka.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 5272 bytes
SHA-256: 89d0a78fbe399bb461d30f6d0ae4203778d05f8fc3383e41aca9ced62be84b79
font_01_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 10736 bytes
SHA-256: 0d9ebb143783ab3bce97306c037d7ef4a21fc09f274709d9901540a5a6452cbd

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