Malicious PDF — malware analysis report

Static analysis result for SHA-256 1756b1328a647395…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 03:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e2079461d9ac0640ab826d3cbba6336 SHA-1: 98d0dcf2608a44334c52319f215aae67cb582333 SHA-256: 1756b1328a647395c86a533af68af5a9b93eace1580584cecb2aced2e23e9958
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm pattern. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the sheer volume of suspicious URLs suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://irlanc.ru/uplcv?utm_term=where+to+find+deleted+photos+android PDF link annotation
    • https://alharithiforcameras.com/ckfinder/userfiles/files/sojubaj.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/powibonunonirugep.pdfIn PDF document text
    • http://aprt1day.ru/file/77784775279.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/98037210912.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/33283194037.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/lalezuz.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/jolokuxekalizufoju.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/pajepadixolazofiwejixupip.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/gikibisi.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/57903579746.pdfIn PDF document text
    • https://linker.tw/files/93881047931.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/44607003000.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/69492387051.pdfIn PDF document text
    • http://jn-zhsc.com/upload/12430632546.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/xerubemo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acbc6bf0bb---32963261779.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/bodekevodagegoxononabi.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/wozimukej.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/69994199808.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/musipogejibirolilagi.pdfIn PDF document text
    • https://nasikampung.info/contents/files/11464394024.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/timiwasolalopawodolima.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/tikijiwenafadujofo.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/75174683657.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/gojejaxaragib.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_off0000b003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB003 10588 bytes
SHA-256: ab5a95ea49c36ec19bd983a0ad446e254b796db6f976016361810a9e955b8aeb
font_01_sfnt_off0000c824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 15876 bytes
SHA-256: 2206546b7f7c55c64381f64212e414837e16bdb947a2b4d760b4b2bad65b9bab

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