Malicious PDF — malware analysis report

Static analysis result for SHA-256 d451aab5f60a1e3d…

MALICIOUS

PDF

92.1 KB Created: 2021-03-07 17:50:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8670331fffb1a687c5f61654d50b2951 SHA-1: f85145a178412b2acf6f122e0762031cc62f6633 SHA-256: d451aab5f60a1e3d6df0d50902907917cfd1b89db846f6bf1b41c01c7d476fc4
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest the PDF is designed to redirect users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pelibifir.ru/123?utm_term=russian+grammar+exercises+book PDF link annotation
    • http://nokutanebufevon.iblogger.org/2151026229.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/27205667905.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/rizasaz.pdfIn PDF document text
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/noxijirunexilimamu.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/zowufibefeturakigon.pdfIn PDF document text
    • https://suxewanevot.weebly.com/uploads/1/3/4/5/134595646/3b51a5.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/53837163478.pdfIn PDF document text
    • https://tefajakitom.weebly.com/uploads/1/3/1/3/131378990/zagatap_roxuduvijikuke_kofufenasufa_garuwodadef.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/jijevelapazejoj_sijanironexuse_vikuderedotal.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/how_to_work_as_a_teacher_in_spain.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/data_mining_techniques_for_associations_clustering_and_classification.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/texozawurazajobunowunik.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/67107335046.pdfIn PDF document text
    • https://kefavobora.weebly.com/uploads/1/3/6/0/136010588/ranapedonos_likuwupirireri.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/20431714048.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajupigirosinaf.atwebpages.com/32951721497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae565fb-eb0d-44f7-b5e4-488849302674/79556796237.pdfIn PDF document text
    • http://numebazo.rf.gd/aashiqui_video_movie.pdfIn PDF document text
    • http://pusebirenox.myartsonline.com/the_all-american_slurp_questions_and_answers_class_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cad8245-81ca-4e10-af08-59a7d3401902/is_there_a_weight_limit_on_carry_on_luggage.pdfIn PDF document text
    • http://titugol.atwebpages.com/12111356254.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/26090556280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24252f24-2280-46f6-b11e-d3b5d9627e08/51058139106.pdfIn PDF document text
    • http://sogoxutagejuno.atwebpages.com/main_theme_of_a_thousand_splendid_suns.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 5364 bytes
SHA-256: d8c65198f1ce6d277864f31f043604352fa2baeaeab53f7323b4e2fc06416bdb
font_01_sfnt_off000124c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 12800 bytes
SHA-256: 9772a300d88f4020157ee2191e1846c687e8fe75a25cad91cbacc8fad8813369
font_02_sfnt_off00014d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D67 16132 bytes
SHA-256: 2def80ee9cf871b89fa1821d83521187f92649b88f41053709a5a2c79b3e7c85