Malicious PDF — malware analysis report

Static analysis result for SHA-256 1361c6f5d901b722…

MALICIOUS

PDF

73.5 KB Created: 2021-09-10 01:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6178e5df1939a8fa9753041bca1ff872 SHA-1: a52838810232142edce716f1ba0ba8890a14f451 SHA-256: 1361c6f5d901b72228c3840ec5f8a38549103a97373c1c09ed82c7c64eb2cbfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability to execute code. The document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or redirection attempt. The presence of multiple distinct hosts and a high number of links per host further supports this, indicating an effort to distribute malicious content or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://thuonghieutoancau.vn/uploads/files/felikulozupajojaje.pdf In PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/lepagusafegajunasosisev.pdfIn PDF document text
    • https://avflash.nl/upload/files/wafobogafif.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/39765498056.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191011191012.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/34968318344.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7tugmc9rg9jlgelsk6uq6d9082/65121079253.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/34161496017.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-1/20210901102508369629.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/27282543407.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/jadurepik.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/fepatawalo.pdfIn PDF document text
    • http://skupka54.ru/upload/m/81889908267.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/9426848709.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/depunagewanomogekelefu.pdfIn PDF document text
    • https://rais.bg/uploads/file/pavemomoda.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/10178163638.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/35495051071.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf031160f---11248180486.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/1071670904.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/6336440135.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210903_1DC7CC333E1FF69F.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/zodamero.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109041748455789.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/xawiliguzisori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+latest+version+free+apk+downloadPDF 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_off0000be2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2C 10848 bytes
SHA-256: d142a433781d1c95ffd5b3cd0445e86791baa94ef76f0fff6ce4d7a6e51cc756
font_01_sfnt_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 15992 bytes
SHA-256: 114724353accb93b873efe71f73215c52fd6b105a5112f026e084f74ca342854
font_02_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1