Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c66ca8cd38daf18…

MALICIOUS

PDF

94.9 KB Created: 2021-03-10 16:34:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7510a9e413e90342feeb1bfa50af90a2 SHA-1: 26aef86e2042d34338ef5b6a4cc8387e532e7f28 SHA-256: 8c66ca8cd38daf18e3ed7c469c251276add32ffbf728ab45747565d3dd13cda7
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, characteristic of a link farm, with at least one URL pointing to a suspicious domain. The PDF's structure and embedded links suggest an attempt to lure users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=oxigenoterapia+de+alto+y+bajo+flujo+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387061/normal_6008f87f7a820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_602e70eab8173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_5ffba4991de95.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/ajjUgiW/final_fantasy_portal_app_wotv.pdfIn PDF document text
    • https://cdn.sqhk.co/rafumufo/jgihNib/62583768515.pdfIn PDF document text
    • https://cdn.sqhk.co/sapasimemo/5hcPflE/novalujimafite.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/halibUq/red_alert_transformers_war_for_cybertron.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_5fc7ca946fc5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465127/normal_603505c501ef6.pdfIn PDF document text
    • https://cdn.sqhk.co/sifomujotaxa/8v7hBjb/foxixefuwudetipopoteretuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_d53f3ecba7a045429e991074810678d3.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_d661fc457b794130a74d00079f7b9734.pdf?index=trueIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_e809d29572e04c0293fed4ce5453e084.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_222855c40e1343c586b702006b4cfeb7.pdf?index=trueIn PDF document text
    • https://0d824eae-b99c-472a-80e6-56b3a201289e.filesusr.com/ugd/7e0eb0_209e62c272c74cc1b49130f14262fd4c.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_59d65c313500439f8281cf36b3f94596.pdf?index=trueIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_ce3dc239194f4c18bc9e8bef7e81dcd7.pdf?index=trueIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_40467813eb9c449aaf9b59da42e9cf38.pdf?index=trueIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_c40fb58ca6e54167b49b5dadf30a64bd.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_9e79d25af69444ec8f206c1298ebd12a.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_557d9133001240f59c238fba88ab1575.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_485b4c1bb7df42e3875e6e8f7efb4d65.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_0b76c7ac0c0746e79a71adb1f917c64f.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_d42eae2802ef40d7b83db832367b0f85.pdf?index=trueIn PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_4048882c938e4fa09ece3f6954f43d89.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_9c66d2f1916748c092aedec8f04d1744.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13275 5444 bytes
SHA-256: e616bd880a2f8a7058ed22b860617c8efd2ba92eb6a0f9cbd2cc07eb8f6af111
font_01_sfnt_off00014519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14519 12516 bytes
SHA-256: 01d5e81146bee5d103e877716869b0e8a19c47f22c59544b2f1837950f06dc14

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