Malicious PDF — malware analysis report

Static analysis result for SHA-256 351e5d12b111c93b…

MALICIOUS

PDF

73.1 KB Created: 2021-05-28 07:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c3723b4bd8ddf8288f035d6dc6ee896a SHA-1: 74f36fb4be2c06ed2e3255139b66f9e3d1d45ea5 SHA-256: 351e5d12b111c93b5269482166056f16534278f58b6abe95ba09492695fe266c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. The heuristic PDF_SEO_LINK_FARM specifically indicates a large number of external links, suggesting a link farm or redirection scheme. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to embedded exploits or malicious content. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/strik?utm_term=how+to+replace+water+softener+filter PDF link annotation
    • https://dosarowit.weebly.com/uploads/1/3/4/3/134315771/fudedabupaj_faguwodilidutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498997/normal_5fe0b21553055.pdfIn PDF document text
    • https://lewutiresapilo.weebly.com/uploads/1/3/4/5/134594640/8067577.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366028/normal_5ffb5c50e3b10.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/8430954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_6040014ae956e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_5fe743f1de4cf.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/2ac16ac0-5afc-448e-a95b-33019f91d7f7/drawing_books_for_adults_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f33da3f1-04fc-4dd1-ad07-8a40587cace5/tomay_hrid_majhare_rakhbo_mp3_audio_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22722d34-b4a0-4ed8-bc51-09b753d9eb16/57623279560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcdb0cd5-9e98-4d40-b3d3-ed25f7f182f7/79599468603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b060a5fd-8958-4103-8573-2b036822e9f3/attack_on_titan_season_4_episode_6_sub_countdown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd3d2669-41bc-452b-87e5-010e4f214ee4/bikefiwepadabefenuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27f7244-590b-45ae-9c6d-9e52d23686e8/how_much_is_acura_b12_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/234f7900-c029-40ca-9cad-27791ad02c09/what_oil_for_2013_honda_odyssey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cec08e5-0759-4280-a88f-0c378f8a9681/why_is_my_directv_genie_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40750bad-2c5e-4c34-a854-1a886cbc9344/what_is_projectile_protection_good_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc01cdca-ca06-4e5f-8996-8f22bbb3673a/bisokaluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04710d80-703e-4ad5-8e55-cc68c145248b/hardware_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c30735-d12f-4c66-9f78-253a94acb6e6/puwobaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5837ea-476a-44b9-af6e-78adaec47194/32903663163.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_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 4852 bytes
SHA-256: 43a57eedc5d09a3a5c83b61f81bc00e3bcbcacadb070f9804a19a007bf1bd43b
font_01_sfnt_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 9976 bytes
SHA-256: 87b89e745a6cb9c4c6bd234f84e2ba76b0e91c2f53073ad6109baf7d7b69e0a6
font_02_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3