Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be1a2e3e9560666…

MALICIOUS

PDF

71.0 KB Created: 2021-03-16 01:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c51e7c0f92a6d94eaa21a63629dd566e SHA-1: 59d9d4684a5eeae754f3e268c4fdf316a40da909 SHA-256: 8be1a2e3e9560666b03f6d65824c0c4c063d715db95ff28847b7ad9666598412
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 0.9991

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://dafemum.ru/wix?keyword=matching+rock+layers+lab+answer+key PDF link annotation
    • https://jivupofa.weebly.com/uploads/1/3/1/4/131406879/fe5056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483855/normal_6040f32ae1392.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/2421735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_5fd1c2fe095ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456712/normal_602337516ad06.pdfIn PDF document text
    • https://tumavogadagakep.weebly.com/uploads/1/3/4/7/134721967/13d6af4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5fe90e81564bd.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/ce4e9858.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/62830132361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_6034435ae2d09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409093/normal_5fcd994ca8990.pdfIn PDF document text
    • http://jelojutu.sportsontheweb.net/52417661786.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471236/normal_5ff7933528957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_602051046c50d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401972/normal_5ffd34ad49325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_603e749c4ba81.pdfIn PDF document text
    • http://penageli.getenjoyment.net/metodologia_dela_investigacion_sampieri_capitulo_10_resumen.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/1e1b468e-abe3-474f-a231-e847ffc6ed5f/55751876268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0057fe10-e659-4596-af30-5ef632e8d0de/dutinozukalazat.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/gaputaxejonan.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/skyrim_se_best_combat_mods_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/jexewinobabavugi.pdfIn PDF document text
    • http://pedamodaw.onlinewebshop.net/lexovafujevewafizukimip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9155d585-a9f2-4076-ae2a-91f968176c21/how_to_get_unlimited_money_in_farming_simulator_19_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4912e2fc-8970-4683-9c3e-af0c0d53deeb/77740716650.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_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 5464 bytes
SHA-256: 4c13a5728f7e24987cdf4fac972ed45926070fe84e4978f86b9173dd4a5a442e
font_01_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 10448 bytes
SHA-256: 51bf382ea54c742bb8f309a6f66e477b742146823a5e926f1e175a22166ae8c2