Malicious PDF — malware analysis report

Static analysis result for SHA-256 58db228fb5b67ec7…

MALICIOUS

PDF

75.3 KB Created: 2021-09-25 22:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d43e1ec22742c3bd0a2d7fb3874b8d99 SHA-1: 67ca209945c9d8cf77a59f6f62f575c1a3ba5306 SHA-256: 58db228fb5b67ec7166065c5fda0f983e1cfe3a33f87e15a462ec8a5a3e19b98
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm on disposable hosting. It contains multiple embedded URLs, including one pointing to a raw IP address, which likely serve as lures for phishing or malware downloads. No scripts were extracted, but the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=live+computer+wallpapers PDF link annotation
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613d310481b10---43786714799.pdfPDF link annotation
    • https://jecoexports.com/ckfinder/userfiles/files/mumuvodepagolox.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/mujorukem.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/78277241835.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/bikefibi.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/ketededokazirenemeg.pdfIn PDF document text
    • http://jar-ted.pl/file/vujixukitifuzenigiwofexi.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/72915369210.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/guwexewekiwumatoratupagas.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/sakujutefubanakawoz.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/davijeded.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/63832740850.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/98932257129.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/20166529578.pdfIn PDF document text
    • https://alutat.com/data/file/saraxokiv.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/kajatazamamudafubejet.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/83190236906.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/buraxomibowewudopev.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/nevawevad.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/geneta.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/96365849841.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/wumatofonuviguti.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/dulopumufogedomaro.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_off0000bd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD31 10640 bytes
SHA-256: fa324d726e48bfa99353971033620d7a1728a54fd482b3f0da5ecaf15202a2c5
font_01_sfnt_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 19304 bytes
SHA-256: 172f70ddf42a22ceb3afba356fc213bd560770bed082287f106a66d9100a278f

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