Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57d9a34c66a13ac…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 02:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 534de8b2090445383d2562a2a542da3b SHA-1: 27e78c918c92fa82af2383662ed1828b0a0e2dc6 SHA-256: d57d9a34c66a13ac9d05a12743f7b0f2f3d599ee9bb0b73237cf5c2a74b81581
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL suggesting a download for 'windows 10 pro free download', indicating a social engineering lure. The presence of many distinct hosts and disposable domains further supports a link farm or phishing operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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://infrive.ru/uplcv?utm_term=os+windows+10+pro+free+download PDF link annotation
    • http://www.dawnrotaryclub.tw/UserFiles/files/bevesaxik.pdfIn PDF document text
    • https://aildf.in/userfiles/file/66774181100.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/wogosu.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/54233585727.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/kufinajakoraxeva.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/24238020051.pdfIn PDF document text
    • http://topp.pl/_topp/file/26778919374.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/sexubum.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/garotepamezinelizo.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/79472808675.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/dusepamo.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/38753410176.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/zotilapulozurelaj.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210906_134316.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/99691156996.pdfIn PDF document text
    • http://tochalco.com/uploads/files/77364554373.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/korawokob.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/jelazod.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/zugodefamun.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/parejiputasudukigepa.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/13615721040.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3bc49881c---fudigepot.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/xipibodexefivivivelubo.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/woworagujubuxor.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/52685196935.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB458 15272 bytes
SHA-256: a5dfc7cbf98b5bbcc2baae571b2c12cfb4497a0c24e9a6eb2da1d35c92e6025d
font_01_sfnt_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 10676 bytes
SHA-256: 0cb709af7238bb369ca337af97c74744bec51ff97cadbf7f919bdedea6139d5b
font_02_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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