Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a94c24aa850b485…

MALICIOUS

PDF

80.7 KB Created: 2021-03-31 08:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 75e6714e590c8bec48b0beb4364e2a59 SHA-1: b9ccf4c8e9e4da8fbfed980931f95aadb6ff2d09 SHA-256: 2a94c24aa850b485b9565949df3f99b28ebc84ba0522a870b94c04033548877e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, containing numerous external URIs and functioning as a link farm on disposable hosting. The embedded URLs, such as 'https://zajinet.ru/123?utm_term=group+text+reply+to+sender+only+android', suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=group+text+reply+to+sender+only+android PDF link annotation
    • https://cdn.sqhk.co/repudodo/jbv1j0v/beat_the_buzzer_game_hire.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/gdtihZs/free_gems_on_episode_no_verification.pdfIn PDF document text
    • http://cyberlife.store/magazine_mockup_psd_freenqjba.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/34788984584.pdfIn PDF document text
    • http://dress-russia.ru/56747103633qrtwk.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/pevimipogu-fovaw-relup-minuvufe.pdfIn PDF document text
    • https://siwevamad.weebly.com/uploads/1/3/1/8/131871433/musekiruvot.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/xenujejepodob.pdfIn PDF document text
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/4300990.pdfIn PDF document text
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/gutubu.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/v2490_foodsaver_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/diwewiduvaz/T0WidGm/anatomy_3d_model_free.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/jabidudovonixow.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • http://newberginvestmentproperty.com/sandisk_clip_sport_plus_16gb_black_reviewwkjl6.pdfIn PDF document text
    • http://teenagetutor.online/xaxumufubwew38.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/what_is_inter_religion.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/9ab6cefa-85b2-4981-ab36-7fdad258cbfa/17321920900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca2144e-d37e-47bf-95fd-9c1806227580/8350028861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84797258-b6f0-4efa-bef8-420402a1af52/who_sang_nessun_dorma_in_the_upside.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f725c5-683a-4e13-a068-714e385a8e7c/xowob.pdfIn PDF document text
    • http://noroved.myartsonline.com/the_plastic_deformation_of_metals_honeycombe.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_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 5156 bytes
SHA-256: f5b6020e09ffddf82dc53077a650b18cb39fb66662f482ae00b80b907dd3604a
font_01_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 11200 bytes
SHA-256: 17bada575d2c3e139ef62a7830924adc519d77a1dfaedea4264eeabbc7e8be88

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