Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37c9e8f2f6dcd74…

MALICIOUS

PDF

74.5 KB Created: 2021-06-07 23:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 380fd1775304729ba48315aaaccc0d7e SHA-1: 599cd15aa256995bfd6243f585fa13390db9909e SHA-256: e37c9e8f2f6dcd74c2a306e72b2355aa507d9d44da72f63433a7ac2bb7f90ba5
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 threat. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of multiple links suggests an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://drafthe.ru/pbw?utm_term=tere+bin+nahi+jeena+mar+jana+dholna+full+dj+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413240/normal_60414d4b6f958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448985/normal_5fcfefcaa0436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_6049174bcda44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407729/normal_605c14f0d7d94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_600ff1a99c555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481164/normal_5fd699562e459.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502268/normal_5fe1786d9c6d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mepijewaj.pbworks.com/f/rodrigo_amarante_tuyo_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a84153-cb6f-48e4-8d95-6ecfef8e2696/64394800510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/305395e9-41e2-4711-9b7f-e5d74ef5221a/dell_inspiron_6400_service_manual.pdfIn PDF document text
    • http://silasofinat.pbworks.com/f/53719309394.pdfIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144483846/65782575408.pdfIn PDF document text
    • http://felinemumivu.pbworks.com/w/file/fetch/144813261/chestionare_auto_redobandire_permis_13_din_15_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c1ec167-a35b-47e3-9663-3b95eea88808/45907598285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac6a3bba-7501-4e7d-adc3-a66d4f8210e1/vapodumevetezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b820bd8-7551-4d18-a84d-57db48e7112e/wugaw.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/f/mahabharata_short_story_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6ce832-31d9-483b-b9b1-e2f55a8f44c5/how_to_replace_keurig_2.0_water_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/403687f4-4a97-44f8-add1-a006b5a90a44/bilepuguzekuxuxonu.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144718077/how_to_do_chi_square_test_of_independence_in_spss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f979ba04-5709-4143-84d3-51da354d3c31/best_buy_covid_19_return_policy.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_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 5484 bytes
SHA-256: 21431c2ff0ef8f45add29ec2051487b59960511b335d7b21252ff4e11bdf243f
font_01_sfnt_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 10536 bytes
SHA-256: a33e491dddbab1dd39136184f2162032d8e19d5642458e4a539660712145dd53
font_02_sfnt_off00010750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b