Malicious PDF — malware analysis report

Static analysis result for SHA-256 61372543441fc58e…

MALICIOUS

PDF

77.0 KB Created: 2021-09-11 05:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 247e744a5945f19a0b4ffcffca0cdd3b SHA-1: 901cd1ca33616dc80c32fe9632e7e35e2023ab3f SHA-256: 61372543441fc58ee32920d3796b7139f462e39d2f872ce12d736b72f4e748fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute links. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence indicate a malicious document, likely intended as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=piano+melody+free+mod+apk
    • http://tecs4.com/intranet/ckfinder/userfiles/files/zapupojuxafewuki.pdf
    • https://socardan.com/userfiles/files/rotibetudat.pdf
    • http://berbun.com/user_img/file/dunaredufaxisizisojofof.pdf
    • http://sperrincaravans.com/images/file/lawok.pdf
    • http://www.azurwelcomeservices.com/userfiles/file/91841023850.pdf
    • http://waycreon.net/bhaskar/yii/upload/files/xijuretipotunovuvixokogi.pdf
    • http://pbpharm.com/upload/files/88643619757.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/tenule.pdf
    • http://sanraimundo.cl/dyn/uploads/file/87972508237.pdf
    • http://sp3siemianowice.pl/userFiles/files/jaroxefikos.pdf
    • http://studiodrago.eu/userfiles/files/65183073008.pdf
    • https://xylemleads.com/userfiles/file/6141422302.pdf
    • http://rinsacars.com/files/others/xodovuvobenokajobitili.pdf
    • http://trustycctv.com/ckfinder/userfiles/files/dijalaxepuziruwatesa.pdf
    • http://linkipt.com/_UploadEditor/files/29999672779.pdf
    • http://potlista.com/file/files/97052447807.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/98e8263e57f0384080d3458fdfcdab5c/48668498618.pdf
    • https://needletherapy.eu/upload/file/kilumekame.pdf
    • https://webmenuplus.com/images/file/65140811645.pdf
    • http://ggmtc.net/userfiles/files/tufegosi.pdf
    • http://studiogiamberardino.it/userfiles/files/19635385590.pdf
    • http://pkynfe.net/userfiles/file/78824463576.pdf
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rotawutemanev.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/37005069632.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c716.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC716 16792 bytes
font_01_sfnt_off0000df2d.bin
586b151662005089ebd25bd8314f413725b1a9b14b660e938de111dec987cd62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 10600 bytes
font_02_sfnt_off0000f74a.bin
ceac2d6c39c960294c106453e9d3e7778938f80b177ff428fa07840a7e1b3678		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 17808 bytes

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