Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12ffb146397567f…

MALICIOUS

PDF

80.3 KB Created: 2021-05-12 01:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d9804b627279d23fcbeb2b26039d7395 SHA-1: 973b9dd6776533cbc5e422e931673d20450486f6 SHA-256: f12ffb146397567f015a8ebd6771155e151d1bb367a5f54d360625c0e6d201df
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://dugedepap.ru/strik?utm_term=why+are+my+keyboard+shortcuts+not+working+mac PDF link annotation
    • http://boomerangoo.site/fimilujaboresuxikapuj8ugop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_6020babf61b7b.pdfIn PDF document text
    • http://bandalet.club/lopepododisezibaqf3id.pdfIn PDF document text
    • http://pasendapp.online/wemunanizexedaguwinudu1qa7j.pdfIn PDF document text
    • http://digitalmedialit.com/4661440675732y86.pdfIn PDF document text
    • http://wisecredit.info/93568666228y281x.pdfIn PDF document text
    • http://usacreditcheck.info/que_alimentos_puede_comer_un_diabetico_hipertensoux3d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6017493a10dc5.pdfIn PDF document text
    • http://wide-take.top/who_invented_mathematics_in_indialj605.pdfIn PDF document text
    • http://oneitstore.info/how_do_you_think_preschoolers_learn_bestk3k6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/28813563-f2aa-4c12-a0b7-d426b5d4d602/what_causes_adrenal_gland_deficiency.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9caa4eb-d1e3-4485-9d29-6bee66143411/minapiduwemabo.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/gutozuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/699ff578-eb18-46aa-93cb-486f78cf5a6e/saxon_math_course_1_cumulative_test_15a.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/webiluwedixu.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_5897cd16df9f41978dc4755c1c72aa34.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_149705f3423b4cf580f62450dec97e20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/vilipe.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/68753287272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4736b01-9384-4a07-8421-46364274fc06/21293610122.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 5732 bytes
SHA-256: 341fc8f411027acba3a56e4c62779feaab579192a4afe5e23f7c6b74ef04a4cb
font_01_sfnt_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 11308 bytes
SHA-256: 1930e521ec93516231de1c1e58174f078dd384d5fbf438a984b7bdf2d6e7470a

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