Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba48b95682b24802…

MALICIOUS

PDF

81.9 KB Created: 2021-02-12 16:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3bfda95e869ba82d54faa2f13ae63fa0 SHA-1: d726a1853c566eb803507e6f6002c3294b7a8a0a SHA-256: ba48b95682b2480268f5ab62e07b3aa4837a947a845a8ad7e050800a62d7eba5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, flagged as a PDF_SEO_LINK_FARM, suggesting a malicious intent to manipulate search engine results or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to drive traffic to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/wix?keyword=no+no+boy+john+okada+pdf PDF link annotation
    • https://cdn.sqhk.co/zanudiwageg/Dicijzd/do_daddy_long_leg_spiders_lay_eggs.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/Tjcgfqv/doretaludumenimuv.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/ZXhhghD/21682040205.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/dhaifih/yandex_browser_with_protect_old_version.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/mawegebazebadudevap.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/XGRmegh/begimafixiriv.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/gPhfgMR/84878178841.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/ajajfgi/dj_mixer_app_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/resasenubori/jhDlejg/carrom_board_game_download_please.pdfIn PDF document text
    • https://pedigibija.weebly.com/uploads/1/3/1/8/131857049/2637c.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/giPjghd/bubeguwifasiporiv.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/ciccjd5/missiles_meaning_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/BEqiagd/75230961137.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xevunikusixed.rf.gd/80809612716.pdfIn PDF document text
    • http://jesebikalag.epizy.com/sebepagoruzeteba.pdfIn PDF document text
    • http://veluvuwipigunuw.rf.gd/yearly_calendar_2018_excel_template.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://scripts.sil.org/OFLIn 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_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 5172 bytes
SHA-256: cdf6bcd01a997232d097ca1cb7a5467899ae6a6cae3d28e8cf6ed4d95a574822
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 10456 bytes
SHA-256: 8059d7cfb878497f2793520901875631cbdb4365c313268d58249ca05a906c28
font_02_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 16076 bytes
SHA-256: 46f6b9c1241daedf27a057eec952969fc58c162a319a1e1e33881fdacfcb0990

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