Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac45db85a8c61255…

MALICIOUS

PDF

74.5 KB Created: 2021-09-09 05:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f11dcd633e9bea323acceee3b6d28773 SHA-1: 1ace69cbb821d826cc2fab11c1f7ba35d401b64d SHA-256: ac45db85a8c6125592d17bdb2f27ddddfb66af5c79d0d09f72d6374cdac1df44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The `wkhtmltopdf` authoring application is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=last+day+on+earth+mod+apk+new+version PDF link annotation
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f9f253c---48161592657.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/13512254147.pdfIn PDF document text
    • http://word.mn/uploads/assets/14464559311.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/xanefadeletukasad.pdfIn PDF document text
    • http://wsm.hk/images/files/15688273917.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/14305607313.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/nufeguvonapegon.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/verowabafazimonoken.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/48813902522.pdfIn PDF document text
    • http://elsped.hu/files/file/76284954150.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/dizuzitusarepuga.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/zawuzasakubola.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/1876235918.pdfIn PDF document text
    • https://izometal.net/mm/file/joxemavamapelijufijopo.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/roluvagomosubotala.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/tojagamiz.pdfIn PDF document text
    • https://betsin.org/userfiles/files/vexuguguzesaxafafovedo.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/pakopetadoniwobozixapap.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/sugovupusiturugo.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/72472410564.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/sorusuvigupajunize.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/52933838747.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/68909240.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/dexowi.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_off0000b627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB627 10924 bytes
SHA-256: e9b1f2dda50081f7ac507740d7cb80234db3e32a11c8f249b83d91421f060755
font_01_sfnt_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 21100 bytes
SHA-256: 20984231b3c752d90a25787dc91741c573d099dd29621dcd6e22914bec7ab19b
font_02_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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