Malicious PDF — malware analysis report

Static analysis result for SHA-256 553b3d5eda2792bc…

MALICIOUS

PDF

82.9 KB Created: 2021-03-30 02:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 06f5ca0ef985d28490ca90beab83f746 SHA-1: 5d9eea3a4653f167148a58c0fcc15a8d318ff5d0 SHA-256: 553b3d5eda2792bc7b4ed51eabc9467a889aa0d7329fd5449c53e4405b455e9b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=53+bank+open+saturday PDF link annotation
    • http://bapatavusirave.mygamesonline.org/bickel_and_doksum_mathematical_statistics_vol_2.pdfIn PDF document text
    • https://cdn.sqhk.co/wixedineve/tggijSE/fulezuboruxowegomujowa.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/19764006804.pdfIn PDF document text
    • https://cdn.sqhk.co/repejuvovod/agfgLij/denuxoromexinijufe.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/9065f76bdf6b.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/3_phase_voltage_drop_calculation_formula.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/bO8nfZz/2166231640.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/bb8f2a04.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/wumasanagenadebewosexupu.pdfIn PDF document text
    • https://cdn.sqhk.co/luwanuriwaba/hjOZiif/castaway_wilson_ball_gif.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/kurodivijiwez-wurezidaxigovod-vedegonaza.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/4277552.pdfIn PDF document text
    • https://finelesazik.weebly.com/uploads/1/3/4/7/134715738/11664.pdfIn PDF document text
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/1865441.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopovis.myartsonline.com/spring_hibernate_pagination_example_mkyong.pdfIn PDF document text
    • http://pedirite.onlinewebshop.net/download_medical_science_dictionary.pdfIn PDF document text
    • http://polabufu.myartsonline.com/occupational_health_and_safety_books.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/java_programming_tutorial_point_download.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/google_map_api_sample_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/great_gatsby_vocabulary_words.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_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 5420 bytes
SHA-256: b28d72906a2cce4e9673f174f915c4944f4c2751850863ee564a58cbb8e1d365
font_01_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 12484 bytes
SHA-256: 907d48731ff20e7f578eb25ac8cde3820893b1e72f945e48962a7a24fc3b168f

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