Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f23413a7548db18…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 18:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7ab238ae9a826cddb1b4a25e11df7d8a SHA-1: 481ddc2bd4f2ec5979dc03a9e06f1c007a0525bf SHA-256: 2f23413a7548db1804c2f8e7b0113fad6f9f315be809b670c440f975cacc0a41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://nomylo.ru/uplcv?utm_term=record+a+voicemail+on+android PDF link annotation
    • http://vnndt.com/Images_upload/files/batudurigimazexofovet.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210912_140649.pdfIn PDF document text
    • http://greenglobepms.com/uploads/ludimonovevada.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/jefiregidisijuni.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/94782748748.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/rirub.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/fomiwasap.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366b3641224---63087597186.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210917105023.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/68918620936.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/fanulisoxupugegizozevad.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/nobitup.pdfIn PDF document text
    • http://sentai.cc/data/file/20210922_190406_514.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/42884572509.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/ririr.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/81761409846.pdfIn PDF document text
    • http://mobil-tech.com/files/zerenefofofisidonakom.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/desuwilamej.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/87280998294.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/xikosederanavasevifaj.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614232886202b---80775886476.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/mamogiladejejepogibi.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/tonada.pdfIn PDF document text
    • http://dobermanncz.eu/files/sajagivino.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9868000577.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_off0000afbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CD 14856 bytes
SHA-256: ace269b46a69d39f2a6919ad865d48daaf74dbe03527e414750558523300c826
font_02_sfnt_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 10376 bytes
SHA-256: 707866e976f18c804e981c2aa314a29cffd600679e594ef5effcfcf3c6c51475