Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a328e0da6622a7…

MALICIOUS

PDF

87.9 KB Created: 2021-09-13 16:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efec14ce57eb20f7521b2be12704ffb3 SHA-1: 0c2fe5bb114eac152545a34db3b8d7fa61b44c0c SHA-256: 69a328e0da6622a7362b46c9e4d0bbad1fc248ca29105d580fa9d0ba35870837
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coretry.ru/uplcv?utm_term=gomovies+watch+now+the+best+tv+shows+and+movies PDF link annotation
    • https://santa.my/images/users/00000000/files/letirubizuzalotufiteb.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/28401805426.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/41316179429.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/89718650041.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/67392761822.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/vomutejoworubuxomur.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/zebalikajutetuxugumogumo.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/molusapi.pdfIn PDF document text
    • http://kaies.net/upfiles/210907205601809088rvmtd4.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/misasupijajijizitutiju.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/pusozezunomugakorezenep.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210910094833.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/texazomikizewetaxo.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/welitukatasebizolupisa.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/84096771193.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/zumuzokagununone.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/82382714722.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/wurajizigab.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/24946101529.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/foxemarijefove.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/385477277.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0892429001631224030.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/tiguru.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_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 10820 bytes
SHA-256: 8533a1b72a3198ec8bf2e2d83f196a6650641745f37c87e01770365864266387
font_01_sfnt_off00010c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6B 17628 bytes
SHA-256: dcb201fc9b8fb39a1b9b8a050b61b37e3e8fe62dfe506f740dbddad65bc08e3a
font_02_sfnt_off000139c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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