Malicious PDF — malware analysis report

Static analysis result for SHA-256 affe1d8b6bdd0dbc…

MALICIOUS

PDF

72.2 KB Created: 2021-09-28 07:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6f5120bbbcb714309035b34af2309ce4 SHA-1: 50d9ecf7242ebd92c13bf040214ffef7fd5cca50 SHA-256: affe1d8b6bdd0dbc8b240ee1296b791824f16ef557b1aae84d475784833f0c73
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of many external links suggests an attempt to redirect the user to potentially malicious websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://efficimm.fr/userfiles/files/30212165714.pdf In PDF document text
    • https://cornerstonelaw.eu/userfiles/file/60411966994.pdfIn PDF document text
    • http://kleiberit.ru/files/file/59476979688.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/porodigavufarudif.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210910_7376E12AF6501E59.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/zorazewifugetepuxitawij.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d7687391c---rejabupeze.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/sedonaz.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/59187627533.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/86313880434.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/fivomurapebelinoguna.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/1259956978614b7d64585bf.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/molatixo.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/rakuxibi.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/43703836629.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/laxupefugutiruzebipewez.pdfIn PDF document text
    • http://yilip.net/userData/board/file/80869037884.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/10371446533.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/r1lu7havdapmo6rjdfvju4j2gv/lusexudovepobakejixabo.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/vabemupiwovodolow.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/xobebotusu.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/pulaxa.pdfIn PDF document text
    • http://naviway.su/upload/files/kazutejok.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/fovugejavan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+full+meaning+of+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_off0000b576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB576 17428 bytes
SHA-256: a42d99f7bb20511f9c1ba51f8983f21ae8be4b752ada446e728e6b8d6689c06d
font_01_sfnt_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 10896 bytes
SHA-256: bb54063ad93ad005c12aaf9487903f306881900cd78f71b23d6a99a094405206

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