Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced738aa9104d01e…

MALICIOUS

PDF

80.7 KB Created: 2021-02-27 01:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: da92f04a2e8ef2370239cc48384a1262 SHA-1: 3783d69034ce5f6db7ca4e4ab74276d5bcb8d919 SHA-256: ced738aa9104d01e2218269a605c81e963bd827a709f9ef4b13688e34039a986
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, many of which are designed to redirect to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and ClamAV detection confirms it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. The primary attack pattern involves luring users to malicious sites via deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=how+to+cite+an+online+magazine+article+in+apa+6th+edition PDF link annotation
    • http://simultaneously.space/1476004878808hiy.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/what_is_the_best_selfie_stick_for_iphone_6.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/16622750880.pdfIn PDF document text
    • http://desokore.medianewsonline.com/96286756425.pdfIn PDF document text
    • http://erogan24.website/919035614935ropc.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/93092011881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_60394746080a1.pdfIn PDF document text
    • http://premial.su/what_are_the_best_poetry_books17ee1.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/9298015.pdfIn PDF document text
    • http://edevletorg.com/color_atlas_and_textbook_of_diagnostic_microbiology_free_download5mxgr.pdfIn PDF document text
    • https://lovevisop.weebly.com/uploads/1/3/1/4/131410094/posug-nomojajutir-fuwes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_6026ad112e268.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/schlage_keyless_lock_battery_size.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_60011e00e6c50.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/simixesoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_602e5cc3357d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vojapu/80_day_obsession_meal_plan_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/adskip_apk_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/gewesuzagelexubu.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/poxatakakaso.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/reimage_anti_spyware.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 5356 bytes
SHA-256: f62cf6b6c7c38078c741554948669338271cb3d4d1fff1d385ea202978e91ecc
font_01_sfnt_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 10396 bytes
SHA-256: 506fce920df8eb39b70931e22ad201125bc47515871e87658b415e1329777a39
font_02_sfnt_off000126f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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