Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a3b94e6d8acc2a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-23 15:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f63bec0536190d23942b16be7228df80 SHA-1: 5e537ef6902b8894b24273b2e60cd42891344297 SHA-256: b7a3b94e6d8acc2addc98d5ac3482b8f30ec0a4931925a318d10f588d7198061
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests social engineering tactics designed to prompt user interaction, likely leading to the execution of further malicious content. The document contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm or redirection mechanism to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://baongochoa.com/upload/file/gomemomikezusir.pdf In PDF document text
    • http://thomas-zigon.de/images/file/karojakozeronuvixuje.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/16873056654.pdfIn PDF document text
    • http://arucax.am/user_images/file/dubakujolumixegawez.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/mobonusiratexaluku.pdfIn PDF document text
    • http://inistor.com/ufiles/files/relekixugimu.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/dazibowe.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/vipepowemiral.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/426536249.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/nejeritebupefajamerawu.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/49370660005.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/gubegufekifanoxa.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad234d8ae---xasitipitifasoponirekimu.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/612fcb4ead1b1.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/96826291093.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/sawarasivagemanem.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/mufeligigejidekipe.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/9818252157.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/65368295574.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/78010922662.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/6573843912.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/walumiw.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/mimifenujavet.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613389d372114---23867151825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=aimbot+pc+fortnite+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_off0000c794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC794 18160 bytes
SHA-256: 1343763d5fb62d5aeedc88cb3c718a124f93f71db9a97eca0f1a5df63865d147
font_01_sfnt_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 10820 bytes
SHA-256: e4bd559f7df2c8437ec1421556ec6659f5ae9cfaac84a89068bc2a736c9563c4
font_02_sfnt_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1