Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb98bdb8731a1260…

MALICIOUS

PDF

72.6 KB Created: 2021-10-01 15:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e78f59022af77547a2a606240efc9a9c SHA-1: ec4df930c4fca57ae8464dc809b88cc18b0eae13 SHA-256: bb98bdb8731a1260f4f9ca7403096483f0b742146ae55836f753e5dccf305735
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. One of these URLs points to a domain that is part of a suspected SEO manipulation scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://citygclub.com/ckupload/files/15511459302.pdf In PDF document text
    • http://dataprint.ie/uploads/file/bidagopudubagefolalo.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2109270953507937515ubhswn6yyct.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/61257595675.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/vowoxanurekubeniguji.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/jodizuzifapovulilas.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/rotitafozixunuxonafaruwi.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/69974399547.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/79128290618.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5c3cfb16---87937194180.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/gevizutosikijazuka.pdfIn PDF document text
    • https://airxps.com/userfiles/files/bigigutox.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/movekikojijudex.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/88359222170.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/9271562996.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/7419077786.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lpfkolbnkliafdstp99rv7rsb4/nosinogezifu.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/10878203916.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/vuduvowufejexo.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/muwiwutezagiriwiviwi.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/tebixumazapovelovigaje.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090612314570554.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/69202112110.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/4035282363.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/40199351368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+send+a+document+from+phone+to+laptopPDF 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_off0000b53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53E 10968 bytes
SHA-256: f3c7b0ef0d7d6679b7ab1e8e1236d5b98352f5bc9228a0d848238d981cf95fc6
font_01_sfnt_off0000ce85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE85 17880 bytes
SHA-256: ebb8fb000cb004558c078b672e2a08d8d34ddbd1aad9e28626bc3c3ef53e8b5f
font_02_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1