Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a369d408cd7f4d8…

MALICIOUS

PDF

89.1 KB Created: 2021-05-18 13:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 16e3cc5cb244eaea6e92cc8b1fe825c5 SHA-1: 5fcdb06a9d5ed226638c0694c211ecf6bdb4c560 SHA-256: 3a369d408cd7f4d87cac29e3d9c9ea9fed1490054ff6be5d6b2c2a79ba194478
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing site. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to exploit the user's trust through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=kinesiolog%25C3%25ADa+y+anatom%25C3%25ADa+aplicada+la+ciencia+del+movimiento+humano+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495550/normal_5feb4fefd2c05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_60218e512d808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480595/normal_60613770b8df4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446790/normal_604cfe63228ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503767/normal_6067a805699f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447658/normal_6059102071859.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zewimu/pioneer_deh80prs_auto_eq.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/jusin.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/i_m_the_tall_grass_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431d532a-5089-43b8-93a9-51fcd783cfa3/20044718546.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/disease_caused_by_air_pollution.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/34944306075.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/major_barbara_movie_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b2e80a-4dd7-43f3-8ab9-2a4c3b5c366b/nozalapumos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec9e8219-02a0-4ef8-bcaa-3ab3d3bb741b/free_digital_tv_converter_box_and_free_shipping.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/casio_g_shock_3232_set_time.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/how_to_get_rid_of_poison_ivy_rash_overnight.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/kinetix_5500_stuck_in_configuring.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/25231284682.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/joint_affidavit_of_marriage_format.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/cannot_yahoo_mail_attachments.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/cheat_droid_no_root_apk.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_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 5656 bytes
SHA-256: c3077efe7416584159a70f5176421274595f0f94cd4ab699691d5d3c45aa1dec
font_01_sfnt_off00012bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFC 12412 bytes
SHA-256: 1101014f7cfb77a5424fcde9aa7589b430fb196c972db911fa82447fd59f5446

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