Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cad77d7ceb32f40…

MALICIOUS

PDF

78.5 KB Created: 2021-03-09 16:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 42211790c3d210266c3bef3d9335b322 SHA-1: 9502abc6892d013bcd16a79d27c797ee1141ee68 SHA-256: 4cad77d7ceb32f4015d8be86d44ae63aa128701245e1774f3ee0f707b3062b88
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to cloud storage, and embedded URLs point to suspicious domains, likely for phishing or malware distribution. The presence of external URIs and link farm characteristics further supports a malicious phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=ventajas+del+almacenamiento+en+la+nube+pdf PDF link annotation
    • http://biwedujurar.mywebcommunity.org/management_information_systems_managing_the_digital_firm_16th_edition_amazon.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/visafidusod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390350/normal_5ff5ff4e9b493.pdfIn PDF document text
    • http://zavutodoga.iblogger.org/valentine_day_images_2019_hd.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/33970337883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456982/normal_602151ca36c53.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/topoganosifoximufobisoxo.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/char_broil_turkey_fryer_accessories.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_60355066f14ae.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/eidw3hS/subifesenijokove.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/12040756654.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/24381557511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460071/normal_6010a140a8cde.pdfIn PDF document text
    • https://cdn.sqhk.co/rigidaluta/jfIhchi/pounds_to_grams_conversion_chart_for_newborns.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/material_science_and_engineering_impact_factor_2018.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/michigan_medicaid_id_number_lookup.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/djgihTo/55305304345.pdfIn PDF document text
    • http://mavogevuz.getenjoyment.net/92644132829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwedidato.rf.gd/32524130853.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/how_to_reset_a_ti_84_plus_ce_calculator.pdfIn PDF document text
    • http://fubusomarixemuw.rf.gd/56269128946.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/92875366376.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_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 5388 bytes
SHA-256: ded9895429cf9e5cedf7ed82a9ea2e3aae7043f708ac6b66a3e30bd160f1b1d6
font_01_sfnt_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 11776 bytes
SHA-256: 975e2491ca5b620d27a63d5e8432b6e27adc09ebd458eca5cdf913984ccf9848

Open this report in the interactive analyzer, or submit your own file for analysis.