Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab7a728429a0212…

MALICIOUS

PDF

92.8 KB Created: 2021-03-29 18:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2015e1b6a5aa9229c1cf0c88a7232fb1 SHA-1: ceb622c53d37087ec03f2128df95344c9f69c532 SHA-256: dab7a728429a021271a22b0e6b9f6414c8a96b3c2504ffbb17498b9c20d3b226
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are disguised as legitimate documents, indicating a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS firings strongly suggest malicious intent. The embedded URLs, such as https://mezovuduw.ru/123?utm_term=chitral+somapala+new+song, are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/123?utm_term=chitral+somapala+new+song PDF link annotation
    • https://cdn.sqhk.co/jusulikipe/ajcuFOJ/simple_modern_single_floor_house_design.pdfIn PDF document text
    • https://cdn.sqhk.co/numobelez/ijsHBhe/fundamentos_de_administrao_financeira_ross.pdfIn PDF document text
    • http://kismyketio.com/practical_infection_prevention_and_control_in_healthcarecwv04.pdfIn PDF document text
    • http://hesap-al-sat.com/robot_seguidor_de_linea_arduinoma25s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_fdd1a248e97b454184ea9e16fcc4a365.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/how_to_change_toner_cartridge_in_brother_dcp_7040.pdfIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_be26bc9bc87248bda97886c0f8a3030e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/robida.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/what_is_qa_in_pharma_interview.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_33268f9788154645870d0c4a26961172.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/bittorrent_software_for_windows.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_2d23445ef68d42f78a9aa0d8cfef48ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/259fb517-a2e6-45cb-81ee-a2630657857a/wewuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/089e24f5-8a73-4ae2-a79b-1fe47b3089e8/656220474.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_02f430ee105d4e2eabb43acef8ab732b.pdf?index=trueIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_43366bbdc97f46ff883816a03e01ccaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/consumer_reports_tv_sound_bars.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://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 5232 bytes
SHA-256: de73a15872751d397df965b1df24d3d99c560033ddfc85c484cf125120d402f1
font_01_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 21560 bytes
SHA-256: 1cd9d0b4c7d18def996de1b205d105765b9c3b9a42e4b397c1c3a56147a97e74
font_02_sfnt_off00013d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D51 11812 bytes
SHA-256: 4c0c88eba41dd14a3277478bc9a4ba34434682ef2e965e3b0ac7603786b9579e

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