Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db42e6e6d3b9ec4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-15 16:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa0dd02b6061b807e18a16ce65ad764d SHA-1: 56b0b285c1af7e3823057225599cb2ff7e05ffeb SHA-256: 7db42e6e6d3b9ec48717d8da874adc05622847fd6a490effdb410baa4f81e9ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating phishing and trojan characteristics. It contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users to malicious sites. The PDF structure and embedded content suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://losungversorger.com/product/file/zotumomitutunovikoguxusup.pdf In PDF document text
    • https://zilalcooling.com/other_files/File/80923382826.pdfIn PDF document text
    • http://metall-press.ru/files/6105707622.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/32565433478.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/65138749466.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109140101238435.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/tinitedot.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/37520520941.pdfIn PDF document text
    • https://parkettworld.com/upload/files/vafebupeluvolizuduv.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/15936703663.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/4012973091.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/jatesepusikot.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/91595798840.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/83788912075.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/8560070952.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/55074865516.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/lepafanufavepira.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/gonumisedujavepunomele.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/feboru.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/direwopujawasagu.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/mijexexitowen.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346abb13b7b---bakikizulelap.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/77112294529.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/62397529324.pdfIn PDF document text
    • https://unosms.us/userfiles/file/gonadebaxidemenazaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pattern+lock+patternPDF 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_off0000cfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 16768 bytes
SHA-256: 5575a4fa1035ead0e4c0ceab0aaefa8c075535c92a1f0250c0b366c3639f08f7
font_01_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 10200 bytes
SHA-256: 17e02752c1c13527b6457e4fdd89e710f6e9d08dac8a3d32320610d01739e20a