Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4847aa311878dd1…

MALICIOUS

PDF

88.0 KB Created: 2021-03-24 03:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1b70ff2f03e7f5628957fce089239335 SHA-1: 1c9fe7134bf41431d6354a6819716686d11821cb SHA-256: a4847aa311878dd14cda6384e22b6bcae7154a6c66408a07d36954a17cce671c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9995

Heuristics 6

  • 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.
  • 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://golowaki.ru/123?utm_term=breeders+cup+2018+past+performances PDF link annotation
    • http://tuzupibu.scienceontheweb.net/fmcsa_medical_examiner_handbook.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/jf0dgde/the_walking_dead_season_2_game_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446937/normal_600c38a2de780.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459027/normal_6007bcb5eaf4e.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/spreadsheet_functions.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/systematic_software_testing_craig.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/L1qEjjs/kidsthrill_rainbow_stacking_cups.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/hLifFEW/40565534176.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/Nfjz4je/the_impossible_test_game_online.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://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_24598ced2214497cac194141f272be3f.pdf?index=trueIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_c6ee580bd4474ab499d74f5dcf52249a.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_a2946e88ccd74a96b3da99f5379fc2a3.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_be9670bf4bd4480198d1d12239987b5d.pdf?index=trueIn PDF document text
    • http://zitulogakapede.myartsonline.com/lufaviripakiwiliwi.pdfIn PDF document text
    • http://dejibokakar.onlinewebshop.net/34251502326.pdfIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_04a7f524c4974049a24d3d2b7300ebdf.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_2c342a24201a4bff9cb9f5c9c7f146ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/jemuvep.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_776b6b8e99e3422c9131722f3fa41682.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_e171c2a646c844c996ac14241409c20a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/28598408196.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/the_unguided_force_of_nature_lyrics.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_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 5672 bytes
SHA-256: 1e35bc3c1be31763f02d8b77cfc4363938cd4786bc1f5d09de233ddb48005a97
font_01_sfnt_off00011c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 11652 bytes
SHA-256: 07d46367f24ab2ceef22b68e9d2c6186aaf6e0c9732913406bdf8387de480b22
font_02_sfnt_off0001441e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34