Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc51eac75a749039…

MALICIOUS

PDF

87.4 KB Created: 2020-11-18 07:24:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5b5fdb2fa66b30773c74fcf88da035cd SHA-1: 62dcce7aae66c2d670b0369cd04d902da095f360 SHA-256: bc51eac75a749039c2f726eceff7ccbbb7f8c97b7a982d2f8a4c3ac63e76d669
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further payloads or phishing. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffking.ru/123?utm_term=quincy+qt-54+manual PDF link annotation
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/1144903.pdfIn PDF document text
    • https://foposivore.weebly.com/uploads/1/3/4/4/134472686/kuwarez.pdfIn PDF document text
    • https://vamewufu.weebly.com/uploads/1/3/4/3/134317042/gitemin-zasew-rorezaxamo-fudumebekokut.pdfIn PDF document text
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/rizejaburapikibul.pdfIn PDF document text
    • https://zijovegumasapal.weebly.com/uploads/1/3/4/3/134307166/7761366.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef389d3-3ae5-455c-80a7-a6bc3e8b95ea/90785852230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f1465e-866a-454e-b15f-38a1384dff24/37470510535.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/37551133359.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/cuisinart_food_processor_manual_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c360fdd6-aa6e-4d14-927c-e6561e907464/porters_five_forces_analysis_airline_industry_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a31f0ed-3443-41d3-b1af-1743f3338132/moving_the_earth_the_workbook_of_excavation_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/pinafemositar.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/ipad_model_mc769ll_a_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/medadele/mofotemuvorumejeguf.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/ubiquiti_unifi_ap_ac_pro_software.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/91196360360.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/biodegradation_of_pollutants.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000139a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x139A3 16540 bytes
SHA-256: 3e83ed34eed6e00b015c5f7122b22db12e0780c24717658958273b2a41147fb0
font_00_sfnt_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 5204 bytes
SHA-256: 405130123b51a269447b78c5f6a8735160efb9329fd068d1a86a5f232a484511
font_01_sfnt_off00011411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 11124 bytes
SHA-256: 0d7b3b3e337470e292b5ad4e660063aa2b659119d8f36fb755a10402e730e945

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