Malicious PDF — malware analysis report

Static analysis result for SHA-256 09393783d574af36…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 05:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fcf3465df9f1c5fdcca2de4bcd74593e SHA-1: 775737d09b0761b415d6aa4fb6c61b3a5794feb7 SHA-256: 09393783d574af369b1056cc20b71a0e02f1869ad18274d979514d7bf69aad5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many of which appear to be link farms on disposable hosting, suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=tn+chhabra+marketing+management+pdf PDF link annotation
    • http://td-mg.ru/uploads/files/86030673237.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/24889297873.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/18453250442.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/6975459693.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/molofogu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/58469608774.pdfIn PDF document text
    • http://rld-carbon.com/file/bozumufe.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/13991040115.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/38985255857.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/26755986421.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210914010256_738590.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147af588c5f4---watuxibopil.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/70805367422.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/11728965606.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/neberakekaluwokupiwa.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/68052690769.pdfIn PDF document text
    • https://ratodua.com/contents/files/doniwigixulazivazusaf.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/peginuripanaforitu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0495be625---17423391963.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/kipivodezulukulikaziko.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/wutilovifizanoxab.pdfIn PDF document text
    • http://kelvista.lt/images/files/sebodasozitinamumeveze.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/16230090110.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/55000812467.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210906112205.pdfIn PDF document text
    • 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_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 10928 bytes
SHA-256: 13cbcd2fc21b9c7bb469a9347102f0f8e4e37bc11abad5fe48af63710027a260
font_01_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 17584 bytes
SHA-256: 7b6ad52538990e51f51a3164a68cadd907cedcf967f2e6439e0b92158607fdc2

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