Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81b5a3ea5e56cfa…

MALICIOUS

PDF

80.2 KB Created: 2021-03-24 22:15:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1f6a2e7e7f487aa54d26b7e3076fcef4 SHA-1: 7bc5983f173baf1afc4085c438a1a69ce9ff2322 SHA-256: a81b5a3ea5e56cfa4eedf2099048ae3c83f72a420bc58c26766a0014f002a9d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was identified as malicious by ClamAV and an ML classifier, and it contains numerous external links, including a link farm heuristic. The primary external URI points to a URL that appears to be part of a SEO-based link farm, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/award?keyword=data+analysis+process+steps+pdf PDF link annotation
    • http://maxoranano.sportsontheweb.net/nomigudozuzomudetim.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/what_are_the_10_naeyc_standards.pdfIn PDF document text
    • http://bolagafub.iblogger.org/free_anaesthesia_books.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/panasonic_2.2_cu_ft_countertop_microwave_oven_with_cyclonic_inverter_technology.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/newawijuzivi.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/big_data_storage_and_processing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tugumeb/jinja_server_side_template_injection.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/gokola.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/88285711643.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/genomizovub.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_86b83d9f97bb428cb75a6f3ac9fe19fd.pdf?index=trueIn PDF document text
    • http://lopafulobitap.atwebpages.com/bohemian_rhapsody_orchestra.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/love_attitude_scale.pdfIn PDF document text
    • http://zovewopot.epizy.com/43400604103.pdfIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_8054b8bfbf504491bf997826144ab14d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad5b5320-2b8b-4b67-a835-ed22b1e8afc4/how_can_i_strengthen_my_back_without_weights.pdfIn PDF document text
    • http://telifujovemevo.atwebpages.com/nepowuwotebun.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/panasonic_service_center_kannur_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23499846-1719-4766-a4f7-4aba74683eeb/30490185174.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://scripts.sil.org/OFLIn 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_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 5248 bytes
SHA-256: 3b037db3bb6bc5ced5e755b84965cfc21d1cf8aaa642273454f843c14473ce7a
font_01_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 10492 bytes
SHA-256: d5d2670e1fadbdd53d9f0c507dca7dcf7b03e5d23dc284b374caa6d81da38a16
font_02_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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