Malicious PDF — malware analysis report

Static analysis result for SHA-256 8940f5b4ba31ae8b…

MALICIOUS

PDF

83.0 KB Created: 2021-03-01 01:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fc51672146583e3e2f8c2ff33c329ea9 SHA-1: 63732fba635f92ff266000ba0f18816bdb5e891d SHA-256: 8940f5b4ba31ae8b3cbb6b15b561681ef2c1a8284d0962629de8bcc9ecdb0a00
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary focus on 'xajibur.ru', suggesting a redirection to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying the PDF as a link farm on disposable hosting.

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://xajibur.ru/wix?keyword=velocity+vs+time+graph+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458854/normal_602eeb724303c.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/tempstar_furnace_parts_diagram.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405904/normal_5fe41876aa827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_601b39a068386.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/english_speaking_lessons_for_intermediate_level.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/information_technology_degree_online_reddit.pdfIn PDF document text
    • http://construt.site/wolavitiwipbil1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5fea1924840b8.pdfIn PDF document text
    • http://frankiearvelo.com/annual_report_of_coca_cola_2018ku3fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juxudawalugevop.epizy.com/fnaf_world_endings_guide.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/the_white_tiger_explained.pdfIn PDF document text
    • http://jamoxuzas.epizy.com/purple_cow_float_recipe.pdfIn PDF document text
    • http://vonanovab.epizy.com/31413983883.pdfIn PDF document text
    • http://mifojizu.myartsonline.com/how_to_season_char_broil_grill_grates.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/woxaz.pdfIn PDF document text
    • http://nowapuporab.epizy.com/free_printable_calligraphy_practice_worksheets.pdfIn PDF document text
    • http://xaligapuk.epizy.com/antropologia_linguistica.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 5628 bytes
SHA-256: 760525e19fc8c40331980d034c6bb939bbce12edab89309813dec4f33b680a5f
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 10428 bytes
SHA-256: 05a05d50e94de195f08f1a84703ebee68253e7d6d1116401095a87b7fd7fc832
font_02_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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