Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32474a552614fa3…

MALICIOUS

PDF

84.8 KB Created: 2021-09-20 05:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3571db52480cdbe509521f1d1e791c95 SHA-1: 87e5ee2cad5ef2d6d030536b39d46911404f9aec SHA-256: f32474a552614fa3a1e99ae1f602b514990325451c2627f84391d7905a263a76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or are part of link farms, suggesting a phishing or credential harvesting scheme. The PDF structure itself is also flagged for containing duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garderoba.sk/images/_file/28069472271.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9bcf3a077---dukumepezafowejek.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/rusevalidom.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/morexixisemupovonowuvazow.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/zaberoguvujujeriludelo.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/fujerafalukalotubi.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/48131593808.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/96166526123.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428971c7184---sewux.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/63701768257.pdfIn PDF document text
    • http://mariancozma.com/_user/file/vinuranirudusavusiwif.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/wudodixurikigiw.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/ririzaxobekolota.pdfIn PDF document text
    • https://tele-video.ru/upload/files/jokenud.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/puname.pdfIn PDF document text
    • http://khocabien.com/uploads/files/83726803491.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631746811.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/tomijafufimaxusekibi.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/tutetigugi.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210907025452.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/nejujasozuzunotosuliv.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/bemujawijanetefitimafat.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/rinuzobofikabef.pdfIn PDF document text
    • http://anindecor.pl/files/file/tujedunukubekezolukere.pdfIn PDF document text
    • http://dsagco.com/Upload/file/36625269894.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/kilepezagojowosisidaker.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/vojawujagox.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/fakex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+connect+android+phone+to+bluetooth+in+carPDF 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_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 19056 bytes
SHA-256: 9c4db4580824702b135286f261dfda3162f3830778d02b74390c89bd8d749fcd
font_01_sfnt_off00011471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 10760 bytes
SHA-256: 3692fbb179cda4a855ebd40fcbcbb791cf4919d46efec4c9fb390d7d3b78cb06