Malicious PDF — malware analysis report

Static analysis result for SHA-256 add993a9cdfdb599…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 11:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 751cee8541c492e573da8e0f5bfbd628 SHA-1: 4cc63447adc0913b23dc1128d95e4160b926aabe SHA-256: add993a9cdfdb5996b6b356e44f994cfd0019d40ddf41b1a86c1710a88e14b59
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://hp-cnc.de/uploads/files/pufesamazikonux.pdf In PDF document text
    • https://kuepancong.com/contents/files/84007145167.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/godunobazonejubatoxotenel.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/larexumobif.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/86310599822.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1aa3baef---9149634900.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/73095330264.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-03-12-56-53-34.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/30268821515.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/xogimiboluxu.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090809163973499.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366b3641224---63087597186.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210907/file/sijuzigutawumik.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/34009677734.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/nimula.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/rakemepakoged.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/15049045002.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/nisuvilebokopabepatutif.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/27460361348.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/60118620343.pdfIn PDF document text
    • https://somogyplusz.hu/files/zoxejowirogamimokowav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=o+que+fazer+quando+o+celular+android+fica+lentoPDF 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_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 10632 bytes
SHA-256: 73bce3bc4f61099cdfeacf050a67e4e4df1b5c85b50ce0db8b66e9d467beb154
font_02_sfnt_off00011560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 19484 bytes
SHA-256: 683e9755df546e05870184aaab6e20a4e842fa25bcef7045514a61aec6faad7f

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