Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb809eafd1610c7…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 21:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 015e3446bf8258bb37c791fb40a865b6 SHA-1: 474494265bc88bd70c50503a1471beaa85d05c0c SHA-256: acb809eafd1610c7125a61ab4281b3c739bb61c9a395ba1830eb4e5f9807e312
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=show+wifi+password+android+app+no+root PDF link annotation
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/pujexidaxotobun.pdfIn PDF document text
    • http://sieuthibds.net/images/files/jevoduvij.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/kizusikuvuvisizuzevimuk.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6a2fa2a31109794daae181a473c9f6d4/ginevagarobeto.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/xomufumematariguk.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fudegexex.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/dijorabibebosoj.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/45983748018.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/59008568890.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/25541749810.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/t05eql42qksau5ntosh3glsc3l/52097374645.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/27368576689.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/ruxobumox.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/gozomewuvumuz.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/vatevejabidudejodazeko.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/dowerumaju.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/25183766550.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/lerariwos.pdfIn PDF document text
    • https://podimercrm.com/img/files/bugobenebu.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/27850243118.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/69079712049.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/ferowumokabulileruge.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/37707974575.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/rinuzuwile.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/30390291752.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_off0000d0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E9 17840 bytes
SHA-256: 40275833ec96fbf294b6a957a59efa709aae7dad3b61535d9c1f659ce67d80d7
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 10576 bytes
SHA-256: 40e408d081751bab8c31cc1e6efac89289cb4dc8d7eb6dee083bcda1a0952d0c
font_02_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1