Malicious PDF — malware analysis report

Static analysis result for SHA-256 8938d9884c5661ca…

MALICIOUS

PDF

77.6 KB Created: 2021-03-30 23:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a6392b31c7137607ca78200739cd95ad SHA-1: b85a6bf48a6a0a40664c353a8803b8db2f77d730 SHA-256: 8938d9884c5661cac7c0a6eaa115a27c777b0d4cb08d0cafb4c810335b51697a
164 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=essential+cell+biology+4th+edition+pdf+reddit PDF link annotation
    • http://voseritulugit.iblogger.org/participatory_action_research_approaches_and_methods.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevexuzuzuku.rf.gd/partnership_meaning.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_7824490417f74038b923e11a4e2e4893.pdf?index=trueIn PDF document text
    • https://f8e303d0-f350-43d2-b7c3-f886ef13ec25.filesusr.com/ugd/1bb397_ff3f23806ec446818d517283fd3b4ade.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd753fa-de15-4ac6-94c1-3ef986dc9e6b/13132795257.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/dabozatikoragukoxaxorebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f63f46-dee5-4d5d-8f55-afa5334bbcb6/forbidden_archeology_giants.pdfIn PDF document text
    • http://musotosas.rf.gd/98270829534.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_e992b7bcddf44341acd3972ebb8b4552.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajixe/udi_rc_drone_u818a_manual.pdfIn PDF document text
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_c00d78117929450ba2952289a8a94d0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3991da8e-f1e0-412d-855b-a318faa6c6c1/unable_to_connect_epson_printer_to_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/guideline_stroke_2562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd696a0-2c39-4eb0-8f60-71213fff34d1/julijizuripebele.pdfIn PDF document text
    • http://japesexazi.rf.gd/78793148393.pdfIn PDF document text
    • http://povezemusugag.rf.gd/1897803845.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/61323153918.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/wd_tv_live_alternative_firmware_xbmc.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_5a61bf2500bc4dc9bf5305c8d2356f43.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kigavanus/jiboxepogeregexibanuxetud.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 5704 bytes
SHA-256: 98b502cab0fcd8f9526657b61e0c9d16ba667903661b996413f1727270ebaa71
font_01_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 11444 bytes
SHA-256: d76b8c603554b8883e0654b857d668903e1b623de1f903eeda480d3ac0bf798a

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