Malicious PDF — malware analysis report

Static analysis result for SHA-256 436be7f9a2f5fced…

MALICIOUS

PDF

102.1 KB Created: 2021-05-30 16:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d7db5270f533bc16b92342293aa1796d SHA-1: be830f46164842582981b09093050fba646bb9f6 SHA-256: 436be7f9a2f5fced523adf223fc5b040cf37c03b4a9bd8b578295e9725d41e1a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The primary external URL observed is https://maypoin.ru/strik?utm_term=movimiento+rectil%25C3%25ADneo+uniformemente+acelerado+ejemplos+de+la+vida+cotidiana, which is likely part of the distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/strik?utm_term=movimiento+rectil%25C3%25ADneo+uniformemente+acelerado+ejemplos+de+la+vida+cotidiana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485828/normal_5fd64cb431f30.pdfIn PDF document text
    • https://zowagozu.weebly.com/uploads/1/3/4/4/134404721/binonizigitome.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501054/normal_60033e75b28bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483354/normal_6005823beaa19.pdfIn PDF document text
    • https://wirukerig.weebly.com/uploads/1/3/4/6/134630703/tikekuxi.pdfIn PDF document text
    • https://mevajivikupewog.weebly.com/uploads/1/3/0/7/130775189/sawatekamomi.pdfIn PDF document text
    • https://dokojivoko.weebly.com/uploads/1/3/4/3/134395563/texapobowak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456140/normal_5fec297a52eac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5ff0d0d956b85.pdfIn PDF document text
    • https://sewidilegewe.weebly.com/uploads/1/3/4/8/134883142/e422c89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_606c809d8bcad.pdfIn PDF document text
    • https://pinipinemijik.weebly.com/uploads/1/3/0/8/130814728/4ed6d9d1504c27.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/c1245185-f8a8-46bd-84bc-b9efd322e778/lozajabanun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b37ec0-0faf-44e3-9805-c6e7e95eaad9/dewalt_circular_saw_dust_collection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e08d176-bc12-40bb-86e9-ea5c7c4a1b1c/how_to_make_a_minecraft_server_with_hamachi_cracked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c311e412-ce2a-40c4-a06a-0da47bd88c6e/replacement_parts_for_snapper_lawn_mower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f402eac-bcac-4127-bc72-df793a3b47dc/the_hunger_games_catching_fire_720p_dual_audio_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d70b9fc-d84e-4d4a-bd11-f23f148440a3/kitchen_task_assessment_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8718f86-f207-4c1f-b4bf-8f8afbd6e7ab/76088333943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c81e2480-934e-49c1-b602-381b6592a745/71756263325.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C6 5376 bytes
SHA-256: 1e5ef151fa65eca07cc195e6868d8bff0d9b5b303dea99bc1c8b3c38059c3ffc
font_01_sfnt_off00013408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13408 14196 bytes
SHA-256: 20b5c23d0c93d71abbc0e4f87b6784730b2df3acbc7ee876c7cd656d929f2abb
font_02_sfnt_off00016328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16328 16260 bytes
SHA-256: b40f56971469914b015ab261f6e34bb222fe064854e701ef01692a1461cb0d16
font_03_sfnt_off000178ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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