Malicious PDF — malware analysis report

Static analysis result for SHA-256 982f5299b357ebed…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 19:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 539dc789f5865eff386bfabc452a5625 SHA-1: 32ca62fd3966b08e165517f6b6e2ad753e0f8652 SHA-256: 982f5299b357ebed14789f95231e57dfa2a775683a67c0fab994423369633fe8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://1hozain.ru/files/userfiles/files/lazojenox.pdf In PDF document text
    • http://kamakuralosgatos.com/uploads/files/87074653187.pdfIn PDF document text
    • http://homeopathyhk.com/files/73542896580.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16142f79c95da3---sixola.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/55674163670.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202198355147729.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/38866223819.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/tafegaxilisada.pdfIn PDF document text
    • https://masihpt1.com/contents/files/mozaxi.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/rider.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/rixeleje.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/148bb9f1ec12e4531dd6d103e317d06e/21459565958.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210903_0DABFC0FE234B4A4.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/safojifobujutodub.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/42809884943.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/rakalu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/10385559017.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/27343830422.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/25253474861.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58233531846.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/13535083154.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/9131978672.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/boruzivivanezutiw.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sozusejixidon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+tennis+without+cablePDF 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_off0000bbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD2 16912 bytes
SHA-256: a4c39b5e01b14ce78162622520b1d73712b7e674655338ae11b917753a06acb9
font_01_sfnt_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 10548 bytes
SHA-256: 0f53fe7467c4c2fe608045532843c57dd209396d0091ea67515d7a1caa9227e5