Malicious PDF — malware analysis report

Static analysis result for SHA-256 99382a5f1a3daf6e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 16:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c5adf567216f7de53418ec0788ae169 SHA-1: 025ee374df0be9ebba1834667a013cc6465e7d90 SHA-256: 99382a5f1a3daf6ebe86e06bdb0c4582e3b93c2e8768263b4566da63a7c5ed1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://adaviestransportltd.com/userfiles/file/vosikifetuvemalener.pdf In PDF document text
    • http://isotope3.pm-ural.com/uploads/files/55142128412.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/dodurilabijuwatatur.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/9404480158.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/67423621586.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/tosagunaxafurenul.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/kitorujedupulatedogesukos.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/52328834115.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/13215308350.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/58138597635.pdfIn PDF document text
    • http://amandamaitland.com/images/file/88193766985.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/78977355748.pdfIn PDF document text
    • https://bselink.com/userfiles/file/28812031174.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/lufodoporowogozes.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/kugidawefigogede.pdfIn PDF document text
    • https://susta.vn/userfiles/file/25457575497.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/65117210952.pdfIn PDF document text
    • http://webs123.com/userfiles/file/mixavuxewumuzebuwude.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210911065259.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/72674822059.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/71536006660.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/50849474424.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/bamivuxalemufa.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/23974600407.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/nexawozinapoxawogebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ariyathe+ariyathe+mp3+song+downloadPDF 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_off0000bea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA0 17596 bytes
SHA-256: 78eee67d829240d40d128a8cfa26056db72a5a442d4b253c42b1255088eb2806
font_01_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 11192 bytes
SHA-256: d88add21b185709ab9c9b7757bb2a5c78858dbdfd65fb20cb7d47a89dd0cb3aa

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