Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d7ecef5d0a4f2e…

MALICIOUS

PDF

60.0 KB Created: 2020-11-25 18:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0c5d371559dd1ae3b5f876b1a5f6a47e SHA-1: 13ba54798019b25477c38ce45a4470d04ed94e21 SHA-256: 41d7ecef5d0a4f2ec6f6413eb73a2910815e90f90c869a55f659f32d67674c35
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, with one notable URL pointing to 'trafffe.ru', suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/aws?utm_term=2018+hd+movies++english PDF link annotation
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/665612.pdfIn PDF document text
    • https://tozupetap.weebly.com/uploads/1/3/1/3/131383790/643ac994bca9903.pdfIn PDF document text
    • https://sukanogijero.weebly.com/uploads/1/3/4/3/134333185/sanazi.pdfIn PDF document text
    • https://paxowamowutujaf.weebly.com/uploads/1/3/4/3/134322095/kifuguse.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/df3709ff-32e2-4612-9ea2-1872184e2d22/reremotej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36af1af9-3b9b-432d-a8d9-63361b0caf1b/43335675269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cda64e2-eeb9-4062-be87-b17f41a34277/zesawimojufekowofuli.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/5996763280.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/sistema_bethesda_para_informar_citologia_cervical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9186b34-3345-4c2a-b18b-79ae29b5320e/24441652131.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/fusionfall_retro_item_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a22c811-e105-4693-b6d4-16bf8aa593ac/limevar.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/figinusiv.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/maps_and_globes_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/76102511141.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_off0000ad61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD61 5420 bytes
SHA-256: 425ea5d2ef650f9310d9d63c566f3938b43e1614fab567f2734824b25ba3754e
font_01_sfnt_off0000bfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBA 10668 bytes
SHA-256: be72ac36ba18ac346bb3130b4061678c6a4f747e708ebc440c19910b5d8beacc

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