Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e166a8f8b3cbde…

MALICIOUS

PDF

73.2 KB Created: 2021-09-11 22:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f079211b6163310b632661a7a806ca08 SHA-1: 4761b218916ccee44715148387237f649a820e29 SHA-256: 62e166a8f8b3cbded77754a40b49efc9b236dfcd809e084aaaeab88c26cabebe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://beysukonaklari.com/ckfinder/userfiles/files/98224554387.pdf In PDF document text
    • https://pecintajp.com/contents/files/7128577704.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1208902248613a03538e55c.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/sepobow.pdfIn PDF document text
    • http://ndt-ultratech.com/files/xasukosepakopejamudi.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210904013530.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/wumobamuximesu.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/65010779834.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/bovozepupe.pdfIn PDF document text
    • https://laps.pl/userfiles/file/97269011185.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb6a148ea---57987632987.pdfIn PDF document text
    • http://ty-int.com/files/files/wezenunofiwomijasisik.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/fesajadogegojepadofavub.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b3a89db5---36529477558.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/vuzofuluzemafe.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/38661359288.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/33312760253.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/68258569030.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/bikaronevozijowejekomini.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///vebofasowufarogaxigobivuw.pdfIn PDF document text
    • http://synfarm.com/upload/files/dolegugawegukosagazegu.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/tazevopigurinofudi.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/fodenir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=is+it+better+to+workout+before+or+after+breakfastPDF 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_off0000bc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC84 16640 bytes
SHA-256: abab43fd6aebaddf3d1f1e141f292a39e4b225f4399a69ac82ba40e8819ed800
font_01_sfnt_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 10424 bytes
SHA-256: 5e6a58920a37e9a78aad035e2627bb4063af6d0115a17cfd43bb4a49175d29c8
font_02_sfnt_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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