Malicious PDF — malware analysis report

Static analysis result for SHA-256 5159e80774f50e2e…

MALICIOUS

PDF

70.8 KB Created: 2021-04-02 15:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6265ef3defaa96fb39de8017112ca734 SHA-1: 9f218f36317d5a2fbd70ffcca8276f66c76d6424 SHA-256: 5159e80774f50e2eb7983e1d8fbeb2f649d6b484f0d7a068ce09702d84ec1020
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, with one specifically appearing as a search result for a book title. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or scam attempt. ClamAV detection and ML classification further support its malicious nature, likely leading to a phishing site or malware download.

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
  • 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://jacksth.ru/award?keyword=accelerated+c+2nd+edition+pdf PDF link annotation
    • http://kpovli.ru/netawijenezakobafarq5u0p.pdfIn PDF document text
    • http://aydym.club/kujidigiroruvabofeci9tg.pdfIn PDF document text
    • https://zetofenudewizir.weebly.com/uploads/1/3/5/3/135308120/sukasiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/tupujokuz/vVGKgcX/among_us_free_pc_download_windows.pdfIn PDF document text
    • http://chategratis.online/naruto_shippuden_legends_akatsuki_rising_cheats_download4tidc.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/hhjiicr/duck_hunting_dogs_wisconsin.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/3jbgdFk/zigufasuko.pdfIn PDF document text
    • https://zitobejamowimuk.weebly.com/uploads/1/3/4/6/134623616/sufumerukujem.pdfIn PDF document text
    • https://rilirali.weebly.com/uploads/1/3/4/2/134235358/kidotiguxibebe-fuzib-jujubetonid.pdfIn PDF document text
    • https://cdn.sqhk.co/gopilufifeda/hiijjdv/best_mud_and_snow_tires_for_atv.pdfIn PDF document text
    • http://naturfresh.fun/vewipuxzywxf.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/8793581625.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/13670858556.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_d135a232254e4783b669a87f7adf911f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/knee_arthritis_exercise.pdfIn PDF document text
    • http://kizufalugomux.atwebpages.com/61270717349.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/worovumil.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_954a5986415546f08fe6c9356cecb2d5.pdf?index=trueIn 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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 5092 bytes
SHA-256: 2e81a77677692cf05ed4477ae36f5309fff2330b1651152d2fe5a71c23c1c207
font_01_sfnt_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 10300 bytes
SHA-256: d796bea5cadb565ef7db24ca797c5929125e3a073bc5c5ddcb3d26d00324839a

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