Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b078d183c90f7af…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 14:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 20c82d5aa54d8a2be9364375a28a3917 SHA-1: ec2aac272d9e079037d37d0d79f41de897aba743 SHA-256: 4b078d183c90f7afa2fcb3cbb1bfdb1e23ce3c8894ce870af50c6ffc332f63e4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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.sudeshnamaulik.com/fckimages/file/nulolejixanapetijikuvu.pdf In PDF document text
    • http://marsalanoleggio.it/userfiles/files/woxesofazimajovuxumu.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/76893143934.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/68013867334.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/lawumof.pdfIn PDF document text
    • https://andana.us/files/files/vajoriwupo.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/23348768516.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614605426f19d---pokurowadewaxofetemulep.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/tosadipumodaponisupibuko.pdfIn PDF document text
    • http://lse.hu/userfiles/file/15769504560.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219101325174064.pdfIn PDF document text
    • https://italvaping.com/file/janagudukejatekomalofudez.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/dunulabenekogobozef.pdfIn PDF document text
    • http://parentini.it/userfiles/files/57302905768.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/16993910649.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/98627635050.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210905_A467188C097083C2.pdfIn PDF document text
    • http://xtra360.net/campannas/file/kefesosaposolebopad.pdfIn PDF document text
    • http://drtamerturan.com/file/64277294272.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/14805065346.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/gubukadegenasekufav.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/rozukofija.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/bujipejotoxumag.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/miwituxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+know+if+someone+blocked+your+number+androidPDF 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_off0000b04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC861 11160 bytes
SHA-256: 6cbcb6f9a01463d74bea41830569697769e3d541ed07342025bff1d0af7a80d2
font_02_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 16224 bytes
SHA-256: cabe128f6c51b6fc656824049b1b002239e163d69304bf0e11885af5e61233a6

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