Malicious PDF — malware analysis report

Static analysis result for SHA-256 f993a1bcb6def7de…

MALICIOUS

PDF

73.4 KB Created: 2021-03-21 07:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 882793d6aafc28a60871d7b5a36dfa4f SHA-1: 9241757ffb99a9231551da5b9645a74dca9e487b SHA-256: f993a1bcb6def7deb6ea4a9e29e497603fae5e71fa9600ed9051d47dbc036cdb
126 Risk Score

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 0.9993

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://ponafet.ru/123?utm_term=maquina+atadora+manual PDF link annotation
    • http://sorebifisawug.22web.org/bexenebobosutebekawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_5fe6de5224593.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_6009608a09784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_603e648514965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_5fd2d2c177481.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/9916d536-f279-4907-b728-76b1863266d5/solution_focused_counseling_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/51358947711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eae4e32-84b3-4d71-9791-fa682f597c12/whirlpool_duet_washer_problems_spin_cycle.pdfIn PDF document text
    • https://2e9d2e4a-15d5-4529-8b29-235aceea4e08.filesusr.com/ugd/cac96f_6ad4b75618df406c895ca8c7b5c22c26.pdf?index=trueIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_8cc1b31f3d894412bada65b2d859af70.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_4d2f7070230d447dbe191cc33b1319ad.pdf?index=trueIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_5f20830f5cbe4c4b9b17ef64656d7b7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pomaxa/63379760565.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_de4c6e16a63e42609db9ff26c2d7fdb7.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_6c2497f0f63a405fac0e40970e756404.pdf?index=trueIn PDF document text
    • http://vobununebufipu.rf.gd/baji_band_song_mp3_download_jayasrilanka.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/mosuxuvanobefudeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4bdc65c-91a6-4ea6-bc97-58df07b70111/what_is_the_main_purpose_of_a_report.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/44042505857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d597e859-55e8-47b3-bf3e-c66325ee9eee/wudekeso.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/how_does_it_make_you_feel_when_you_help_someone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539bdffd-3bb8-4466-872b-6633583dba88/new_love_story_movie_2020_hindi_hd.pdfIn PDF document text
    • http://menoziduwuju.epizy.com/affidavit_annexure_cover_sheet_nsw.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_0567bc53a2aa46bbb3286d8859625754.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_258ec7a0445d41ccb0f16a0fe5e26ef3.pdf?index=trueIn 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_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 4924 bytes
SHA-256: 014cdd021260cfb10f24308e3a6ff023da122d2fc06ebccd3312421f1141d12a
font_01_sfnt_off0000e75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 2092 bytes
SHA-256: de1e3b05f6b7db969a2106f0cba9afaea1a3935ba1d0a06230102f8707ec6c08
font_02_sfnt_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 11592 bytes
SHA-256: 97fc73a53d6de705503c26c9de7cb26f122b5deadf058af1adb4b08afa0da6ba