Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e09374e9b4b2b0b…

MALICIOUS

PDF

75.6 KB Created: 2021-05-28 03:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 76c2126cd65224c548f8889a6e5c3a5f SHA-1: 23a6e7ec07d8bac39c481a14c12cfb6cb302080e SHA-256: 9e09374e9b4b2b0bd4b877cb411c125d191b48b928f7a3f15883e004eb129a81
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, including one to 'jacksth.ru', suggesting an attempt to redirect the user to a malicious site. The document body, though heavily corrupted, contains references to 'Samsung service menu region change', likely a lure to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=samsung+service+menu+region+change PDF link annotation
    • https://nubawobadeg.weebly.com/uploads/1/3/4/1/134131997/9663212.pdfIn PDF document text
    • https://torobekaxiwe.weebly.com/uploads/1/3/1/3/131380482/towokarigukofa_powekeniwogapag_rubudozitukavo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420224/normal_5fec7096d5ff6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_5fdd5dc1325af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_604ce0456d5dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_5fe070c65b8f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418170/normal_5fc5b80f53ce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_604cfe6f2787d.pdfIn PDF document text
    • https://luliguruj.weebly.com/uploads/1/3/4/8/134879099/34f195.pdfIn PDF document text
    • https://lizuxafemow.weebly.com/uploads/1/3/0/7/130776517/48cf2e5b6bd.pdfIn PDF document text
    • https://namodezax.weebly.com/uploads/1/3/6/0/136055978/fajipufogad-babomeletukaza-vikakopeko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494875/normal_60382adf9cb2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450040/normal_6026af3c686ca.pdfIn PDF document text
    • https://nutumavu.weebly.com/uploads/1/3/5/4/135400781/a259a15d8c3c91.pdfIn PDF document text
    • https://danizejoj.weebly.com/uploads/1/3/5/9/135990884/kimitalig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476943/normal_5ffac21440ad5.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/8da30191-cb6f-46ef-baf2-b1cfeb244e80/7th_grade_area_of_composite_figures_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b2343d-9356-440b-aca7-9e32079163c0/medstudy_pediatrics_9th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e080e4-163b-4326-8841-b4905c5b3312/40303568609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c20f925-e524-4944-8393-fa79ec432360/las_100_mejores_rockas_kalinchita.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_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 5344 bytes
SHA-256: d03350768e986da80a24e948ed6642cb192a5bbdfe6cbce193ab4ec051818a5b
font_01_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 11288 bytes
SHA-256: 3cf38897d3a7edc0b5e5e03582bd7c7f0214be65627dbfc63ae1fb24bbda3d17

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