Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7e3448095d11ad…

MALICIOUS

PDF

85.4 KB Created: 2021-10-05 05:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ced8e97977cd72170e72c3c659f9cbed SHA-1: 4a958e08b670b1daf8fbf300981a36a771ce6454 SHA-256: af7e3448095d11add2a7bf4f56ca7e29e48d64ac3305b1ce4424d26a50beed01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to a link farm, with a specific heuristic identifying it as a disposable link farm on potentially disposable hosting. The presence of external URIs and the link farm structure suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sitarofindiamd.com/userfiles/file/suxapivinuzavazijat.pdf In PDF document text
    • http://oshcongregation.com/userfiles/file/9132494273.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/bizewibukivisonafedezume.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/zopigakimikebel.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/73254810705.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/novowizoxuvuwejaga.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/99616939206.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/xefejenomasojate.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/vurunofopiso.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161567c3744ff8---xazawabexivukepirafuru.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/51295820790.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuwopufunu.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/busatofovanobabiluva.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/mowosojejomameb.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/21891912694.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/73542064604.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/58361746017.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/xizelov.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/muvadijajerodop.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/pazukafaja.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/volaginitil.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/nijiliduko.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/78647782393.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/miliwisikoxox.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/26912788568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=jobs+by+yearPDF 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_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 17948 bytes
SHA-256: 062d305769c3e5cdde4908d1d46992c5fd1f423d7096eedbf7802163d0b90425
font_01_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13160 10008 bytes
SHA-256: 781d57fb1e385555e29d2c18fd6e07e37074c1abcbd7fccdd542f1d19074acb2

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