Malicious PDF — malware analysis report

Static analysis result for SHA-256 753683df446ec9b2…

MALICIOUS

PDF

77.2 KB Created: 2021-03-11 22:27:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0f12d1aa67cdf1e4d04d3c7822a63457 SHA-1: 5fc9ec6db30cecc14e5e9dd60c3cc9249c0cb27a SHA-256: 753683df446ec9b2b864784863f02d451957b123521fae36408f2f95979306d9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://xezojetit.ru/123?utm_term=physical+layer+guided+transmission+media PDF link annotation
    • https://zegikawa.weebly.com/uploads/1/3/4/6/134640481/44214.pdfIn PDF document text
    • http://gratoramaa.website/46927288765dobi0.pdfIn PDF document text
    • https://fuvenaxumegiga.weebly.com/uploads/1/3/3/9/133999500/noraje.pdfIn PDF document text
    • http://groby-ritual.online/65922272680cgr83.pdfIn PDF document text
    • https://tegupovo.weebly.com/uploads/1/3/0/7/130775278/paketenewebiwo_fujejolil.pdfIn PDF document text
    • http://tavaxibewoposo.iblogger.org/bully_lite_v4_apk.pdfIn PDF document text
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/mujedukuzone.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/841393873075u70i.pdfIn PDF document text
    • http://italywow.pro/how_to_use_a_rival_electric_food_slicerbewnn.pdfIn PDF document text
    • http://koteyarn.moscow/startup_ranking_2020ntokc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/toni_morrison_sula_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a39f1ac-3f53-4879-b2c2-e8f669a1a7b3/nomenclatura_quimica_organica_ejercicios_online.pdfIn PDF document text
    • http://pibowaloboko.rf.gd/maven_checkstyle_report_configuration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29a9cf0-6636-48f7-9175-30a4d8a582c4/70119361441.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/tidedozifinuferiritu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74423dd1-3480-482f-84ab-9ae82b35a79e/30868874232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1912aff8-0d17-4323-8705-6c16875536ea/how_to_build_a_easy_bat_house.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852048d2-e7f1-417e-a9be-4680c2db2b27/sedevalagi.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/490804717.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_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 5456 bytes
SHA-256: aced3249ff94100b2f428b349bd3774e50da1aa644b80e27f1cdef5da5d1dbfc
font_01_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 10064 bytes
SHA-256: 3af7a1030c46de50ef8e4fd905410f1c33366fb2e0b69ab22db8741d502e571f

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