Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa935d1644b09d67…

MALICIOUS

PDF

75.9 KB Created: 2021-05-12 20:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8e997cff8ba86bfa41ff93395d03de85 SHA-1: d319587ff3d33e3dfaa6941d2e435a618bf227f4 SHA-256: aa935d1644b09d67b4be168724082ac34ff5a2ebb32e34b91710e1959056323a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=yamaha+dgx+660+price+malaysia PDF link annotation
    • http://fepekasizu.iblogger.org/89757042657.pdfIn PDF document text
    • http://donbetosstreettacos.com/solving_simple_linear_equations_worksheetooyb2.pdfIn PDF document text
    • http://forkidsshop.online/pofukototibogakunirosu1qsb2.pdfIn PDF document text
    • http://uspex22.online/display_cost_center_budget_sap13t9p.pdfIn PDF document text
    • http://canlisohbetim.net/lebisobitipoluzazqgdd.pdfIn PDF document text
    • http://damvglaz2.xyz/netflix_mod_apk_for_ios54nbz.pdfIn PDF document text
    • http://narewenu.22web.org/xizumotalizugaget.pdfIn PDF document text
    • http://ompala.store/noradujutulewoxz956y.pdfIn PDF document text
    • http://gexedufez.22web.org/bullet_bandi_dj_naa_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://josekew.epizy.com/mejores_cursos_de_ingles_en_linea_mexico.pdfIn PDF document text
    • http://funadorexizuju.rf.gd/vugaz.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/bumekewezodemase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7159efa-e89e-4edb-a33b-b8f5e6a4fad0/395044586.pdfIn PDF document text
    • http://nawogov.epizy.com/zivamotat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a540ad62-858a-4423-a2af-eecd193d2f45/literary_criticism_online_course.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/chaps_restaurant_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/pdf_braille_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/98544171385.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/android_modern_authentication_support.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_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 5916 bytes
SHA-256: b01ad33bdf78b0c1d3067146972476c318d667500a76c58f8d461a852f324385
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 10364 bytes
SHA-256: 3bd7ffc8044ac0eb0395b5b09bf6b1eb921b927be5b8678994a2d3c7d0488f73

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