Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d5c50bac82d346…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 05:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 105bd4d312cdf628eddb6024bc72bece SHA-1: 5802663bc0b5845e25a0e0aa184645ec3deccc4e SHA-256: 11d5c50bac82d34663348ee3f8079356f0be34c931ab33e0c500f2f89ae22dcb
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. While no scripts were directly extracted, the ML classifier flagged it as malicious, suggesting it's designed to lure users to potentially harmful sites. The presence of many external links, including one identified as a potential redirector, supports an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cornucopiafrederick.com/uploads/files/ribabepufawo.pdf In PDF document text
    • http://stellarp.com/userfiles/file/jekami.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/46258202878.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109062201244910.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/simiw.pdfIn PDF document text
    • http://telecycling.info/files/file/pitomowixafiniva.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/gomilodifar.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/kodeg.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/lonidupewefub.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/17369783215.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/xulumefoxazawibeg.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/7337825239.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/gadinamidux.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/dadaturunovuwibijesugim.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1632428783.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/75495529518.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/28949963225.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/nemopolilesojuwebawijibo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/81262815509.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/32578735762.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/xiwopujuzubi.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/bisokup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=freakonomics+pdf+freePDF 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_off0000af29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC740 10708 bytes
SHA-256: cb8ca27de94adce9bbfb288e77c9d58ca12fb3cafbfb297f415bb6c100d32434
font_02_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 14868 bytes
SHA-256: 8fb565c160862e074f47979a5e119069cead2dd6cfbe033f6a8da11e76e823c7

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