Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2688ba1a6ec2944…

MALICIOUS

PDF

83.8 KB Created: 2021-03-09 01:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 881708332636b927eaf6e19aa412b3db SHA-1: de32c9d65cdaff05bd6e44fb6b1d6f0053c06438 SHA-256: f2688ba1a6ec2944022a5e631b6649df5b603ae39a5cc584aaa0ef7ae0c61845
136 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains multiple suspicious URLs, including one that is heavily obfuscated and points to a domain associated with phishing lures. The presence of embedded URLs and the ML detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://zajinet.ru/aws?utm_term=what+is+an+action+button+on+instagram PDF link annotation
    • http://winatesef.sportsontheweb.net/hewlett-packard_hp_probook_6455b_drivers.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/73956271717.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385635/normal_5fdd321523298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476595/normal_6046a43ac41fc.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/landing_page_wordpresstd92o.pdfIn PDF document text
    • http://fherixq.com/pdf_reader_viewer_2019_downloadvxzb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420761/normal_5fee9860625d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530712/normal_6007efd6e07b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371248/normal_5fec2eef8d379.pdfIn PDF document text
    • http://opt05.ru/characteristics_of_dark_romanticism_in_the_pit_and_the_pendulumdh07h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369646/normal_5ff97d2790a0e.pdfIn PDF document text
    • http://raisinshq.pro/jexixakebipigenapinigasowe4289.pdfIn PDF document text
    • http://1yamal.space/99918996695iewzh.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/tixedujegibex/berilio_propiedades.pdfIn PDF document text
    • http://jewofeket.onlinewebshop.net/bibliografia_apa_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/febukopolukuzidebeji.pdfIn PDF document text
    • http://kavuduvolilazod.myartsonline.com/mcgraw_hill_ebook_return_policy.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/jejoduxe.pdfIn PDF document text
    • http://dipagepe.atwebpages.com/randomized_algorithms_tutorialspoint.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/arduino_adafruit_neopixel_library.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_off000108f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 5336 bytes
SHA-256: 39e3838a71f0b58cb31f8bf5529f224694739801f437020d747295e200c4207a
font_01_sfnt_off00011b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B02 11420 bytes
SHA-256: ce3519cba680e17d375c6ee60b1397fdb3363d8e30804dee074acc8f21139f78

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