Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe85a082d0a21479…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 05:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2212de2b19bc86ddd073e8e9b37f27c SHA-1: f47a6436d1bbe0e098b2c91c863d3b9dd8c6c675 SHA-256: fe85a082d0a21479910fa506d213673f89a3c52b82c2a4cfe4ff01410c10b70a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The primary function appears to be redirecting users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://soleilboo.com/images/uploads/files/zokosipuzeme.pdf In PDF document text
    • https://towa-aaa.jp/userfiles/file/sonesisefejerukugurufo.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/4749522847.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/61242393394.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e673216780---sijinamaro.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/52812304915.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/67689189919.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/19833597485.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/93201453420.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/dafizopodoxebesi.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/jizamarudelu.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/riserarupawosusuf.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/lizatiletexakotixu.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/kuvujubejevepodurigin.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/3339921225.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/64970881026.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/27157051367.pdfIn PDF document text
    • http://bociany.sk/media/file/30219965398.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/zonabanal.pdfIn PDF document text
    • http://jar-ted.pl/file/11948771864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cara+reset+gps+androidPDF 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_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 10552 bytes
SHA-256: 36b146d8b1f5aac5b9371938d4c78fdda76000506366379fb8496e05d50fe0b0
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC2 19124 bytes
SHA-256: 6526ae8058f1d27cb68f8441866e0d66fee8cbca9c80aa9a415531e458a3eb27

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