Malicious PDF — malware analysis report

Static analysis result for SHA-256 759e7ca5ba3b4964…

MALICIOUS

PDF

90.4 KB Created: 2021-09-08 12:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 0c5f84f18fcac13d17123a1a6fdbe8a8 SHA-1: a66b4cd6c5d3c731acc1057b46f3a21406afd8be SHA-256: 759e7ca5ba3b4964dd21ed5d020ffb087f593b8f086a7369675ffbc664f2eda9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://medicom.pl/userfiles/file/74140012305.pdf In PDF document text
    • http://tiszaikaland.hu/upload/file/rebadobixad.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/kofuwaxim.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/79885790954.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/gulizumudosumolan.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109071431272567.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/88193842730.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/68669770224.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/88042022191.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/48719886220.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/36120667223.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/vanozaxedixineleliluxiw.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109011356536150.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/11536378229.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/62508469725.pdfIn PDF document text
    • https://harmony.im/userfiles/file/50553633396.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/wipukibof.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/17173488034.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/kejanog.pdfIn PDF document text
    • https://polaria.cz/images/file/zagilesudugulolo.pdfIn PDF document text
    • https://davnosti.ru/upload/wovanafibiwitojiwuja.pdfIn PDF document text
    • https://halead.com/uploadfile/1630818048.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/fefuxovefidivutidikugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=eragon+dziedzictwo+tom+2+pdf+chomikujPDF 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_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 11424 bytes
SHA-256: b8b4c6ae1826013920681e3edd14ad076d62b744317c031ec7cb0c1b3ab04a54
font_01_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 18340 bytes
SHA-256: 9abcd765407eb8bb2e000a000506eb49900434d4971e2be9c082093ee056a992
font_02_sfnt_off0001441d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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