Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91017e8b242a2ec…

MALICIOUS

PDF

79.3 KB Created: 2021-03-29 22:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b628b51bddef83fe49f90048c544cfc0 SHA-1: 8c742cc41cc806d4da5aa59712d672ccae795859 SHA-256: b91017e8b242a2ec97d5665b662774214a7fd3c410697dff0d52f2fcaa807043
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://soxebez.ru/strik?utm_term=new+moon+spells+january+2021 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465949/normal_5fd379a266d50.pdfIn PDF document text
    • https://cdn.sqhk.co/bikuloxisage/e43lUhb/glory_road_soundtrack_imdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_6060f9a4313b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5ff2495511b2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_602ea6f868773.pdfIn PDF document text
    • https://cdn.sqhk.co/vojasipi/jUjHje6/the_university_of_hong_kong_admission.pdfIn PDF document text
    • http://jitokinut.iblogger.org/32218248535.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
    • https://uploads.strikinglycdn.com/files/431f6c87-1b39-46e6-99fc-907b57bada02/1845581967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8603afe6-cb7e-4b66-8ea6-36a180bc9ea6/zawejidobozijawinalipoli.pdfIn PDF document text
    • http://fukasutatota.rf.gd/bleacher_report_eagles_bears.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20a20d4-9979-4376-ac44-99843ccee25a/what_books_should_i_read_for_computer_science.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/kaffeeform_coffee_sticks.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/vizio_e701i-a3_power_cord.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_a811d6ec27184f969005249d16b04df0.pdf?index=trueIn PDF document text
    • http://vazojebimuvap.epizy.com/android_background_color_transparent.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_5a4b4de264d44f15905274091f705406.pdf?index=trueIn PDF document text
    • http://zatugawaxevi.rf.gd/tekebugonuguf.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_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 5284 bytes
SHA-256: d506cc79f1034ae447637a0d647d37169b4d141405fd4cd4eb0d21a638fe260d
font_01_sfnt_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 11096 bytes
SHA-256: 1cfa6e37b8f1607d418079b65bd90cc78143e7437f6ccc6ef9e094333b85fd99
font_02_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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