Malicious PDF — malware analysis report

Static analysis result for SHA-256 66118fcf76e1d86a…

MALICIOUS

PDF

89.8 KB Created: 2021-03-15 10:22:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5646d8f981cf0996ff00866adc0812ee SHA-1: 569a976ee7e352a1cdbd8db132a05314f3d4b280 SHA-256: 66118fcf76e1d86ac237e68540b0ff5c8b3b392b3cca4fabfb2313bc2484ee4c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/wix?keyword=8+ball+pool+auto+win+apk+latest+version PDF link annotation
    • http://foxilajat.sportsontheweb.net/how_much_pulse_oximeter_is_normal.pdfIn PDF document text
    • http://4gusevshop.space/how_to_pair_to_jabra_freeway57ouv.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/company_of_heroes_movie_review.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/4772188.pdfIn PDF document text
    • http://blue-tick-central.com/convertir_de_microgramos_a_mgi4t3i.pdfIn PDF document text
    • https://dibonividuz.weebly.com/uploads/1/3/4/8/134885927/692859e0d1c8a16.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/74cadf8532d8ee3.pdfIn PDF document text
    • http://indital.space/682762974892o5up.pdfIn PDF document text
    • http://lg-supportteam.com/87091905198rlaio.pdfIn PDF document text
    • https://kezikiwagoxarud.weebly.com/uploads/1/3/0/7/130739267/7d5643ce9467d4.pdfIn PDF document text
    • https://romidemifavev.weebly.com/uploads/1/3/1/8/131857114/8903627.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/3167885.pdfIn PDF document text
    • http://vovality.club/58054294207r8m1p.pdfIn PDF document text
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/goseju-sujuwekowesutos-wazazofiredusis-leguparufemaka.pdfIn PDF document text
    • http://hrushch.space/lebodopfzh12.pdfIn PDF document text
    • https://jakuxilo.weebly.com/uploads/1/3/4/7/134711712/tukalazubat.pdfIn PDF document text
    • https://basupetuwesaf.weebly.com/uploads/1/3/0/7/130739706/ba162a.pdfIn PDF document text
    • https://togawikanow.weebly.com/uploads/1/3/5/3/135320583/kawikani.pdfIn PDF document text
    • http://oneshops.space/land_guideline_value_in_velacherydovcq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mojogoralil.onlinewebshop.net/how_to_cancel_alarm_casio_watch.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 5152 bytes
SHA-256: 4c3cf22d2d3e733b247e6b38deb99c6effde16885766c37322e3e749f050b415
font_01_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 10900 bytes
SHA-256: 9aae21ad2c862fac32a482c3fbac3e40a893e56b83c1dfc5e6d801e9fd34c41c
font_02_sfnt_off00013220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13220 17196 bytes
SHA-256: 51f9d724eb70c18075482d5085e4a9996657dfd6f6e1b264d3b2492fe774748f
font_03_sfnt_off000149b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B3 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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