Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1af1e8db67433fe…

MALICIOUS

PDF

71.0 KB Created: 2021-02-09 12:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e201a9180b3974fd5e17ab3bcfae0968 SHA-1: 76e425f815728715058fce1465f7d4d533e32db4 SHA-256: e1af1e8db67433fe7413ed7e823f26349b8f651a835c53d293d177fd9d6e66e3
274 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including critical detections for a malicious redirector link and brand-impersonation credential phishing. The ML classifier also strongly indicated maliciousness. The embedded URLs point to infrastructure commonly used for phishing campaigns, suggesting the document's purpose is to lure users into a credential harvesting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kurasapar.weebly.com/uploads/1/3/4/9/134902571/3040798.pdf.
  • 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://yafferge.ru/123?utm_term=volume+of+a+cylinder+exam+questions In PDF document text
    • https://cdn.sqhk.co/desogepupema/icihCsY/allegiant_movie_cast_name.pdfIn PDF document text
    • https://kurasapar.weebly.com/uploads/1/3/4/9/134902571/3040798.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/ijJucKM/foto_superball_run_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/haX7jaD/kisodetatutitud.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/FVbibdX/jasasaxafa.pdfIn PDF document text
    • https://cdn.sqhk.co/fekesolip/Zv6tEXe/snowball_fight_pc_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423750/normal_5fce17369530b.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/jowutoneranemuk/complaint_letter_hotel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/anbe_sivam_tamil_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/fishing_guide_lough_corrib.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/58197569932.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/amcrest_view_pro_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/nujiresatofi.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/devitupiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/zofewi.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/sozujutixuza.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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 5428 bytes
SHA-256: 2e27dbb178e50d39625e5c9353dcd17426732a2b8d45eee6c14fe741e7d47d23
font_01_sfnt_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 11092 bytes
SHA-256: 4cf26d969b959cd0ac8efdfa3d7630021066db22ddb037b105b726b33653ed73

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