Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d62a0271a52370…

MALICIOUS

PDF

92.0 KB Created: 2021-03-14 19:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9e6700a374b117d3d1787657ac6d7b31 SHA-1: cea5f7ce09b9004489b258bea88d8032ca9492a2 SHA-256: 16d62a0271a52370ab9b6e6fa8f14d426980af4b23ab744aa556cf8072cb24a9
142 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document uses a lure related to 'petty cash book excel format free' and contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing attempt to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://lozipotod.ru/123?utm_term=petty+cash+book+excel+format+free PDF link annotation
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/7245a04c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368969/normal_5fc882f178acb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_600fc0b2ebd85.pdfIn PDF document text
    • http://reggis.info/rezidagjr2ft.pdfIn PDF document text
    • http://sacredname.ru/sepebu0syh7.pdfIn PDF document text
    • http://idealicait.website/non_communicable_diseases_in_uganda8ir7x.pdfIn PDF document text
    • https://xitolomeka.weebly.com/uploads/1/3/4/0/134012462/745107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5fef640457897.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/who_is_the_strongest_character_in_jump_force.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377924/normal_5ffc7f4d2c1c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473645/normal_5ff4d1dc9c46b.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/zuvobibapovu_lovusuwatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_6046c0c42a966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500897/normal_600aba19a9be6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388177/normal_5fee429c85c67.pdfIn PDF document text
    • http://vuxilenusip.mypressonline.com/readynas_nv_default_password.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/fadodeguduvufu.pdfIn PDF document text
    • http://wisitens.online/77112472075kgs5o.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://dezobod.onlinewebshop.net/15495585147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642758f4-fef6-4313-99f7-4bae6cdfd10a/teaching_by_principles_an_interactive_approach_to_language_pedagogy_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa0670e-53ad-496c-be00-d013984806d6/nativity_play_script.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/bissell_spotclean_pro_portable_carpet_cleaner_3624.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 5132 bytes
SHA-256: 45f439f0b85965e6912561144972682787d385cd6f9423fc9388ef9d9343bf56
font_01_sfnt_off00012ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE2 11684 bytes
SHA-256: d7d740a0ebefc76d28cfd0bb767fff7c3fd24669d0f360099dfcedb53d132233
font_02_sfnt_off00015470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15470 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71