Malicious PDF — malware analysis report

Static analysis result for SHA-256 8530e73fd9994557…

MALICIOUS

PDF

83.3 KB Created: 2021-10-05 02:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 530d53b7e890b75890ee03d09efafbd1 SHA-1: 8311ed61032b73adc7fbe6044ac0019878f22ad4 SHA-256: 8530e73fd99945572e229755dbec965b42bd71ee776bf1d699a92c8e7e2f48fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, identified by heuristics as a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asiavent.com/UserFiles/file///duposirasiki.pdf In PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/46452459781.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/goduzizupipusozazufap.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/rabarovodag.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148920d4845d---jotawopat.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/ronovuzerulutuze.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/76051780862.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/23088796663.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/71394140006.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/nupukumopejoxobelubu.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/75773124631.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/kuriwijure.pdfIn PDF document text
    • http://brlairport.com/images/file/resevutorobixokerenodab.pdfIn PDF document text
    • https://viceda.com/userfiles/file/83861127523.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/34696228414.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/49294448023.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/rugajiputisuzozu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/tobopewusozekufunejiwo.pdfIn PDF document text
    • https://beleznayauto.hu/galeria/pictures/29627306233.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/famasun.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/69747525703.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145a4f4701da---8469880129.pdfIn PDF document text
    • http://art-ball.net/files/file/sodaluzizepipaban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=find+2+points+on+a+line+from+equationPDF 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_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 18396 bytes
SHA-256: 4d2a4359e6f066d07cc8fc241def25b5fb3b48db681e2cf6d2a6a522b215fa54
font_01_sfnt_off00010dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 11000 bytes
SHA-256: fd0ffbf34393c01ce760cf2b1071629d1b91a99f6dc00391fedd7dec10f3609c

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