Malicious PDF — malware analysis report

Static analysis result for SHA-256 7476d1a4c76e9d4e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 09:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 124c26ad7a2359e21ef8882239deb453 SHA-1: 6ec5c810d18b50ccd35765a76ee42322ecb41b72 SHA-256: 7476d1a4c76e9d4e3a99dd2754b57913aea85c66d4733b28277cd829a46ceb83
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a likely phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://crysiq.ru/uplcv?utm_term=type+of+pattern+lock PDF link annotation
    • http://tiyuchangdi.com/upload_files/files/20210901_005034.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/lofisigoxivunakevujanapu.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/buxunawodedumuve.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/26142812831.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/61184130402.pdfIn PDF document text
    • https://securitydm.net/slicice/file/28907074655.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/notiwapebuvoxo.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/16892254951.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/43920010767.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/28796658041.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/8940478541.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/49004138206.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142acc5acda4---93624270594.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/bajuwos.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/70801973963.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/82512135912.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/53266210639.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/judolapisibamunatevevubul.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/60845934089.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e58266056e---lenerunovudusefavira.pdfIn PDF document text
    • https://stormester.no/files/file/22083438149.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://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_off0000ce61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 17756 bytes
SHA-256: 8c6171a07ddd5686e1bed543fd3e7fe5de721acd59570b16160ce707996193dc
font_02_sfnt_off00011478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 10380 bytes
SHA-256: 16aece099eaab2910b2fbcd2f00053e35281cd170644ad4d0578cbafcd8f67d8

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