Malicious PDF — malware analysis report

Static analysis result for SHA-256 f666cf77d3620276…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 03:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d563e291d527735b47fcb8843c79e372 SHA-1: 6a9df07835b6b79a53ef5c2313ff191509b2aa5b SHA-256: f666cf77d3620276e5c234d337e7303ff77324c00ab78ead7af4441f15421598
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of embedded URLs pointing to other PDF files, indicating it functions as a link farm. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM confirms this behavior, suggesting the links are intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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://inprovitecuador.com/ckfinder/userfiles/files/14679670598.pdf In PDF document text
    • http://achwvs.love-mrt.com/upload/files/90028905227.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/11718073433.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/rubiwaw.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/kimexabokoju.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/fadudinogajasurefijijene.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/newonobiniwurub.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/52722005951.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/11555473109.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/logegurerunubuwewudofimaw.pdfIn PDF document text
    • http://katela.net/userData/board/file/lizuxusozojuvemazogap.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/52226793323.pdfIn PDF document text
    • https://kratky.eu/files/file/48822333547.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210918082323.pdfIn PDF document text
    • http://grafittipng.com/userfiles/files/12063880227.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/4631037572.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/53980837907.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/65183114846.pdfIn PDF document text
    • https://servicepapik.ro/files/pilamodebatowukuri.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/92175123399.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210924144619.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/bupitolupup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=portal+office+3656PDF link annotation
    • 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_off0000afad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAD 16072 bytes
SHA-256: 1cb4f2ed8a0079c353ccf9447f31641ae42cf5b81936fd8d71569c71af560ff0
font_01_sfnt_off0000d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 10532 bytes
SHA-256: 3663c507ae234020dba2d53eeccbba5c970c03f72eb4ecd6ebdd6809b7f01687

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