Malicious PDF — malware analysis report

Static analysis result for SHA-256 a071716b234887af…

MALICIOUS

PDF

81.9 KB Created: 2021-10-04 17:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 65ed3b0564d9c2c2f11431bfee561693 SHA-1: a574f30b6ea31702a962421ca247547b6e55150e SHA-256: a071716b234887af2616649f3085aca25c618c0b5b17ee146f929784e0149772
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad2a6df9d4---kunufusuzizaponagiremanaf.pdf In PDF document text
    • https://konteshamamotu.com/userfiles/file/83825514611.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/gukubonuwasibixedevu.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/forupozarekukudigigukud.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bemululi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158c61cc79dc---30036986026.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/joketajudukor.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/xemalivunaso.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/getexamopu.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/74971850762.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/81077588264.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/rinomedajewowepi.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/53657569547.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/tajibaperuzaguvevizekuro.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/76390144707.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/vadivila.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/numov.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/luwizom.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210903223027_v4nbut.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210903_124650.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/35340305406.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/81726713511.pdfIn PDF document text
    • http://kaies.net/upfiles/file/29912848966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=santa+claus+is+comin+to+town+claymation+charactersPDF 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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 17696 bytes
SHA-256: 252f330f4ea3a3db4868f2205fa307f3e5c3035b9baf5673b0db06e5b5238c07
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 10872 bytes
SHA-256: d62048290b75590e5edf1f7421a57bb8f42eb7172f0323d780444bc5e9330728

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