Malicious PDF — malware analysis report

Static analysis result for SHA-256 37904d0eaeba7539…

MALICIOUS

PDF

114.3 KB Created: 2021-03-15 04:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a7ea61963a6bb0cc1a4492aa0a93d4f2 SHA-1: 8dc6409c50649c92ba60fe8cd63324b8bf105c41 SHA-256: 37904d0eaeba75391c84effe1de8c00caf477a0f20d6afd696f9d42502a7d7f3
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://lozipotod.ru/wix?keyword=cricut+explore+air+user+manual+pdf PDF link annotation
    • http://tekplafond.xyz/55132859096g44tz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_6036704e4a02c.pdfIn PDF document text
    • https://lekinimogasujif.weebly.com/uploads/1/3/0/7/130739945/vumisikiwatozusitej.pdfIn PDF document text
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/tuzowegimugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458618/normal_603300f025398.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/8499888.pdfIn PDF document text
    • http://gubuxuk.scienceontheweb.net/16929341251.pdfIn PDF document text
    • http://xonigej.mypressonline.com/ahlan_wa_sahlan_magazine.pdfIn PDF document text
    • https://pejagefetem.weebly.com/uploads/1/3/0/8/130815482/33eeb43f254a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_60196bbc8207f.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/pazaftpfb9.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/jadanowujepoli_dojinor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_603eef0da82fe.pdfIn PDF document text
    • http://getsol.xyz/as9100_rev_d_gap_analysis_templatebwxnx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_bb0fd463aae4481ea5d13bb0832665cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/350ce0ec-aecb-46cf-b3d5-b74199f3368f/bimama.pdfIn PDF document text
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_82ddc8f3b83d42b39d373bf9a6c059d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c816f8-435e-403d-872b-da5ca65a9ab4/lord_i_need_you_chords_bb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9674acf-aa95-43cc-b0d2-e578edc8a2e5/perutidefobijodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/809572cd-9b34-4cb2-ac66-76e4f9103564/what_time_does_the_stock_market_open_and_close_india.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_off000180bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180BC 5272 bytes
SHA-256: d175653d71e374f17b037b0f8a0a2434abdf92838e7ab2c2e63db3bf0006239b
font_01_sfnt_off00019294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19294 12180 bytes
SHA-256: 354f46cae48c91521728d1815fce3040b9ad6f7c72fcc66576ff005d98bc7aa3