Malicious PDF — malware analysis report

Static analysis result for SHA-256 35dcdb9f0c301017…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 05:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0682c30d2f49a4a3a74fb76f4a799320 SHA-1: c066d2820080bfe8cf6dce9b742385c49805fdea SHA-256: 35dcdb9f0c301017b556008646c2f171812ea7f54321dcabfeded11573b9f173
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to disposable domains and are presented in a way that suggests a link farm. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inoxbienhoa.com/upload/files/fuvozizexuxabufoje.pdf In PDF document text
    • http://eskuvoiiranytu.hu/blog/file/52660140330.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/makitisujovujobo.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/54260844152.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/072585742.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/wubej.pdfIn PDF document text
    • http://labradory.pl/file/mesexuroba.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/jozujiseliwosejibaziwow.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/xapajideluvezexugo.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/febexere.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/52945859704.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/69123243127.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/30215487022.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/padotalopulixodufip.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/87995585300.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/jenugifosebuvejor.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/21135074466135e8f742d98.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/98223945313.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/boboreruvigezexu.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/votitutarokewogixexuvawit.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/zuwadevadunepexezijoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=euro+truck+simulator+2+android+appPDF 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_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 10840 bytes
SHA-256: 01acfbff18c88ad1f6f135ae4ff418e01ecc4c6b4969cbf36e98e1738626ddfd
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 17188 bytes
SHA-256: 96042e4a6cbf72f85fb6a07f89190cd864b2da2f9efa0323646e81cd45c3aaee
font_02_sfnt_off00011986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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