Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6248295026e997…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 02:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ba07fceb0e4df57b9b5f93e2f55d73d SHA-1: cffecfd968d305eac52bb15f23bdb6b7aac5a93b SHA-256: 1a6248295026e9971d986afd8d9bd5993f1bea538952e408a442c5ec6967a13b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for malicious PDFs to execute code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a link farm, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs, which is a typical phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://etasystem.net/userfiles/files/pasimu.pdf In PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/51742501190.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/62139934778.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/lafuxusutowe.pdfIn PDF document text
    • http://maha.tcnme.com/chop/multimedia/userfiles/file/kusijomoremonajofozedizi.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/manurin.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/98540181087.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/50442264125.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5uf2sh0t23ravdobou6u5nent5/gekepikatu.pdfIn PDF document text
    • http://anindecor.pl/files/file/zakexajukibarewez.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/vugibodadolirimasa.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/wivumomitevanejemosuv.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/zewaruvelokokebarinapota.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/33750542531.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/vipusawexomipef.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/35938558364.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/9935850014.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16150c24b1dad6---60442417907.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/sewujitovug.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/lepagifebenaradudopegadu.pdfIn PDF document text
    • http://novafish.it/userfiles/files/244583487.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/21977074604.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/bafasubizuwane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=murder+mystery+2+knife+value+listPDF 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_off0000ae83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE83 10880 bytes
SHA-256: 8d167e100b0032b9a562ce4a18f54d0af64a1742f27a878f7295d61e1f4bc212
font_01_sfnt_off0000c7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C1 18116 bytes
SHA-256: 7a7e98bf6b46546450da26d248f253ac7aa1ca479f44895acbe310d576ef80a3
font_02_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1