Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c1ea035fff19b4…

MALICIOUS

PDF

67.4 KB Created: 2021-04-20 11:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b7f0c675fe64a6bcc80362565f1aa43a SHA-1: 5e4e86192892eb9164f984adbe4010c0483583e1 SHA-256: 81c1ea035fff19b4875f0311ac6fb965dee0af7cfd902aa78a2cb2ee4659cd6d
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious sites.

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 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://zajinet.ru/strik?utm_term=how+to+set+a+acurite+clock PDF link annotation
    • http://mists.space/rodomunakrkzeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_601bb7545c272.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_5fd67426cd174.pdfIn PDF document text
    • http://neojust.ru/comcast_tv_guide_not_workinguejpv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414860/normal_603030ef8ad5d.pdfIn PDF document text
    • http://finonit.mypressonline.com/where_do_babies_come_from_book_for_7_year_old.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/cTCWTFf/xogowononagifovamimado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367665/normal_5fc66d0b39e88.pdfIn PDF document text
    • https://cdn.sqhk.co/fovulifavu/Shahhzg/4k_wallpapers_auto_wallpaper_changer_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nowagenika/5jeicif/kiwobavebusokadulop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_60354934b3b50.pdfIn PDF document text
    • http://majusenise.sportsontheweb.net/animal_adaptations_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisukuvi.atwebpages.com/roziged.pdfIn PDF document text
    • http://mepigijevu.rf.gd/lenovo_t420s_i5_specs.pdfIn PDF document text
    • http://pebomotixot.myartsonline.com/preeclampsia_acog_2020.pdfIn PDF document text
    • http://pejonoma.epizy.com/classic_wow_leveling_guide_horde.pdfIn PDF document text
    • http://firasakujataj.epizy.com/20229251292.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCE 4908 bytes
SHA-256: fa5c99019bb931b001ba2284a8ec1a2e574c3f9391dd4cc01de9bd17452d1baa
font_01_sfnt_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 9968 bytes
SHA-256: 0c0a1a81e73aff1404988497cbf88aebc0e5cdfdbb4872c81287228e3d9ff277

Open this report in the interactive analyzer, or submit your own file for analysis.