Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dd2c2d83ec39c8…

MALICIOUS

PDF

72.2 KB Created: 2021-10-01 00:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4493821d75f7e9e9457ad1804e495ca SHA-1: 44270e27fa5ca6bb05a363211fa9c416ec2064e7 SHA-256: 87dd2c2d83ec39c87b5f9d9e41a3846a0e490009b762015b9a1651fd90dc2188
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting its primary purpose is to redirect users to potentially harmful websites. The presence of embedded URLs and the classification as 'Pdf.Phishing.Trojan' strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=turn+mms+on+android PDF link annotation
    • http://antonio-pelella.eu/userfiles/files/86514178160.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/22707056273.pdfIn PDF document text
    • http://forti.in/userfiles/file/27966547862.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zumimosenerofitizo.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_24_07_20_52_5932.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/wilewumuloni.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/52662546507.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/gezawometotexobutevuxo.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/fojametivapifepifolepu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614e767705689---pevopexajoxalofina.pdfIn PDF document text
    • http://qwerty.pl/_data/file/bebumojoke.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/60249876165.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/modanutomeno.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/geboluvifomupafaputefodef.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c9edb9f814b354fb0358bb437eee9938/nunufoxekefafam.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/34241291332.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/wopop.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/zegogotafujikepalegakar.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/98367309884.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/turaliwesajekofezokod.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/rutijatu.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/xavifepoladad.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/88632717935.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_off0000b640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB640 10196 bytes
SHA-256: 72a6e9b7bd1ac405c9628a34885b6ffbd4ec94ba3b18fec04752a58e5850e7af
font_01_sfnt_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 17984 bytes
SHA-256: e8e8abba7615c4bdd66ff1d7e50eaac2628b86874cd5a0f58a40a259903c26ee
font_02_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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