Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc4e7068aef4c5f…

MALICIOUS

PDF

82.8 KB Created: 2021-03-29 21:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 040091d7f2c7859dc25f5b071a41ef14 SHA-1: ea4980eef92a6b7b14bd3148d63111172f9ecac1 SHA-256: 5dc4e7068aef4c5fe6081170f4f38896d010b2f514a34457c607837904fd2f49
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain ('zajinet.ru'). Heuristics indicate the PDF acts as a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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/award?keyword=chief+financial+officer+duties+pdf PDF link annotation
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/xinemufope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fd3869052e0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_60311c71c578f.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/personal_statement_for_university_examples_chemistry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5fdbfa5d286de.pdfIn PDF document text
    • https://vuxisiso.weebly.com/uploads/1/3/5/3/135321279/4a217c3fd.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/elective_mathematics_syllabus_for_shs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486061/normal_5fcf2eb4430ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475563/normal_5fdfcdd85c5ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5ffe708079291.pdfIn PDF document text
    • https://duvugegigoga.weebly.com/uploads/1/3/1/4/131409055/ramiremakimar.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/10th_class_cbse_biology_textbook.pdfIn PDF document text
    • http://lezobul.medianewsonline.com/kenmore_coldspot_refrigerator_repair_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486061/normal_60598070643b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407756/normal_6014fdceef0a5.pdfIn PDF document text
    • https://fefujosiniw.weebly.com/uploads/1/3/4/8/134862858/goxavogo-mudedipur-derosolutido-delenuwonakeli.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/1733247.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5fedc483dd6f8.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/what_does_blood_behind_your_eye_mean.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mozutulobiris.onlinewebshop.net/7993560674.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/open_google_drive_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/10686804674.pdfIn PDF document text
    • http://fawikinego.myartsonline.com/cambridge_english_advanced_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/95879524814.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_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 5148 bytes
SHA-256: b3a54656d8bdaefc6b636e67328127643b502880143d538a7a2dc32d7ecb69f1
font_01_sfnt_off000117c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C1 11180 bytes
SHA-256: 084bd5c309929a8a739950d66a27b31bab1d570a80d87d01681f875e6bd79e5d