Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7aea86e44b8ec91…

MALICIOUS

PDF

88.3 KB Created: 2021-03-05 00:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f6cadde888aa30ec77dcec535e42a948 SHA-1: 01a33559d0730e2b164bf9153c6945d46777745e SHA-256: e7aea86e44b8ec9187c14ed7c9f5a7343e8c5e65009a05aa8c29d60ba321d4a1
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with at least one identified as potentially malicious. The heuristic firings suggest the PDF is designed to host a large number of links, potentially for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nipisod.ru/123?utm_term=game+of+thrones+valyrian+language+quotes PDF link annotation
    • https://cdn.sqhk.co/nupasoxure/WXhhYns/how_to_make_vanilla_sponge_cake_recipe.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/4186859.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/hfgehiA/download_home_design_stay_here_mod_apk.pdfIn PDF document text
    • http://wibedepotemuru.22web.org/golovitowivixab.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/fhcjbic/shattered_glass_megatron.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/hfgeigd/11051634262.pdfIn PDF document text
    • https://zopupafi.weebly.com/uploads/1/3/1/4/131454349/jekaxoleke.pdfIn PDF document text
    • https://sejubapis.weebly.com/uploads/1/3/4/8/134887951/5723751.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokonabat/2ibhaA7/xuxuwopelux.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/7b80be70-9851-4806-8755-7dae98a07dc6/wosaromizekeki.pdfIn PDF document text
    • http://vujipuxi.epizy.com/longman_dictionary_of_english_idioms_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5f51c6-a3e4-4ffc-b3e8-a8d462cf633b/degonapulilozisupitogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a06d129-dc8f-4746-b626-25e8bd23060f/kifuk.pdfIn PDF document text
    • http://dukizovisepo.rf.gd/14958468930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26304fb5-d8fe-4718-b522-8087a0247c78/36564858315.pdfIn PDF document text
    • http://bipupobipe.rf.gd/pikumaresukar.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/55165357311.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/mipixupab.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/wordpress_website_builder_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca269d8-1752-468f-b936-f8755d15882f/zifivakag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20791bb-9d41-426b-a034-b036e9201209/ravuwej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df28fe34-9b9d-4e06-b59f-70b7c1bb8768/steve_jobs_autobiography_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f87d1d-2861-4a72-9907-9c47196e0f3e/international_stock_market_open_on_sunday_and_sunday.pdfIn PDF document text
    • http://tujiwetasus.rf.gd/serusapezixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8333eb6c-fef4-4c70-8895-c4f93f4d38ac/what_restaurants_serve_brussel_sprouts.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/jigagomas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b46b932-544d-4188-b7d5-33d8732f583f/sasotoreborebolezojototan.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_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 5384 bytes
SHA-256: 38093080c6162c565d477941f559d73d221e0e9474f658b2a4e2f16f8812e11f
font_01_sfnt_off00011e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6C 11032 bytes
SHA-256: d0a9531503a5c5a7eb44a473345095978a6cca1d2920d33f6129f58dc3f3639b
font_02_sfnt_off00014385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14385 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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