Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6acf5713fe56827…

MALICIOUS

PDF

74.9 KB Created: 2021-03-17 03:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3e20bb5fd698cb3e34adb0f0bdab91b7 SHA-1: d9acbe71fdfbeeab8f260c44ab02e204e2182c85 SHA-256: a6acf5713fe5682716c693c729309fcb050ca59375b910b1be184f36f6110f20
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm designed to drive traffic to malicious sites. The primary URL, https://midufefew.ru/wix?keyword=dragon+adventures+script+v3rmillion, indicates a potential phishing or scam lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://midufefew.ru/wix?keyword=dragon+adventures+script+v3rmillion PDF link annotation
    • https://cdn.sqhk.co/jimavidozeze/9jhOdf4/baxebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_603e5dd33b9f8.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/OpkZ2jd/chemische_formeln_schreiben_am_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/aP1hj1t/8120325725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_603541cac3401.pdfIn PDF document text
    • https://jatitebomotopoz.weebly.com/uploads/1/3/0/7/130776336/725531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_604696d5d9e74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465559/normal_60072b1be41ac.pdfIn PDF document text
    • https://kurinasuvofete.weebly.com/uploads/1/3/5/3/135334761/jesoladuxuko-raweguvuzivib-peretogekijifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5fe64582d98c0.pdfIn PDF document text
    • https://cdn.sqhk.co/koletexun/euhcx04/when_has_chicken_breast_gone_bad.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/e8ggggL/business_insider_stock_picks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5fe8fb5925064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449776/normal_600bfcee53445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499995/normal_5fc834a58cedb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387713/normal_5fc6b9b2ca1ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_6aee6155f5884adb8f50024c90aa517c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cafd51d1-4311-4305-9f39-b922399241b5/how_to_download_sample_packs_for_fl_studio_20.pdfIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_a777a938f8614646ad956516aec0928c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06741418-97ef-42fe-8080-bbd55f792eb2/can_you_day_trade_bitcoin_on_coinbase.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_8ca28bb87ae5453b8560551e97ebcd69.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_aac8d4f0d1c24ebcb0e6801b37b28fa7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c9eb74-822a-44bf-89cc-4ef846c2379e/40457364555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7c87b9-3049-462f-9a6f-08799a394f41/kiduzidorirowa.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_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 5616 bytes
SHA-256: 017e40d9f2670f7249b929aa2e75adca174c283b867c3e67f954776e0de9c7e3
font_01_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 10744 bytes
SHA-256: 7dffc70cff256945af278f59e96bee36ff58a9d93a6603dc0212e4935d846a07