Malicious PDF — malware analysis report

Static analysis result for SHA-256 04eadf2fb6d1fd0c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-22 21:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0ac436fb7efdbdac1a784df527dcf31 SHA-1: 02d702965b6cd8a45eaa394b02d8a21106ae24ab SHA-256: 04eadf2fb6d1fd0c2fbf1cd1b4193497b159f238cc4963fe90075e4f0df233dc
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, indicating a likely attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://castilloexterior.org/ckfinder/userfiles/files/kebowaluvefewog.pdf In PDF document text
    • http://gniortho.com/files/Upload/file/damonajiruv.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/ruzobinomogifowuw.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/totofe.pdfIn PDF document text
    • http://northamericaminingexpo.mininglifeonline.net/file/467tzyjFerYuA3vn.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/bazejoji.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/26680656999.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ddcb8caf0---nakatoxepegij.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/23372270832.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/51842167615.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/77599180158.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2e18cdeaf95836ef215baf87df9216c2/seruxiledo.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/fapaxeminu.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/bowumuzetodolomo.pdfIn PDF document text
    • http://www.agot.pl/upload/file/39204962959.pdfIn PDF document text
    • http://dobermanncz.eu/files/jofumejozadebuwipal.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/46969104984.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/kawivozazipurodevosepene.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/lazanugeriv.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/juwogagu.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/1184731313.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/10482533880.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/6369321346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=watch+the+black+panther+online+freePDF 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_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 18088 bytes
SHA-256: e5760978f99fec66a413cdf97d724f661c55974e20f62c640b4be7b3eb2349c4
font_01_sfnt_off00010da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 10632 bytes
SHA-256: 1a5c33bad7e9c2f14884ba2c2a4a59237c2084c9cb32c884737d134cff1d0731
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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