Malicious PDF — malware analysis report

Static analysis result for SHA-256 3851efda9ab6fe71…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 07:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1d87bb0b1d68aca9ceb27bf787e5dcc SHA-1: c0c6adbd8884f74daf4e04f2424f6046d4b02bf1 SHA-256: 3851efda9ab6fe71b256f8aca87ee10697c35b73c1928a9ff971fed1f5e16319
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the PDF is used to redirect users to potentially malicious or phishing sites. The presence of embedded URLs and the overall structure strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=epub+reader+for+android+apk PDF link annotation
    • https://ximangcampha.vn/upload/files/87622733421.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/xakobutawesagesofatagideb.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/78333189954.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/giwiruferagapegunozodej.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210913011635.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/73979510012.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/rogipozuzexevufibaziti.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/59362575445.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/36199266908.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/mekaduginobo.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/94034769437.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/busabilajipokekuzonif.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/javojor.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea59297f04---jujibatunudole.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/93497134552.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/mutizadizile.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/vogab.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/57424890376.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/bifudubinuvuxedefenibo.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/zopazirapubus.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/wofutopadiwopig.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/8tqcau139ll3vte1bcpnpjs6ic/vovovavunukoduginezoge.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/zutujatedisopajav.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_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 18488 bytes
SHA-256: d6571bae851e40dc59cbe017553c1d492a6afc92d3b608f71030ea3d0ac2b526
font_02_sfnt_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 10492 bytes
SHA-256: 25194afb9f0baf6a169c1c2f881bdb61feb7d8cc2b9eed885ed9c4a5c85374c8

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