Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fc25d6915ca7b1…

MALICIOUS

PDF

89.9 KB Created: 2021-03-28 10:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fb184c0d6789f5eda0fcb4f3d34c8d58 SHA-1: ac2d266ae8c1dc616c0fc1688bc37bac6b062660 SHA-256: 93fc25d6915ca7b1aaed9464c6733d339ae057fba66f2b4d48c163dd63d2ea77
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+to+use+porter+cable+dovetail+jig+4210 PDF link annotation
    • http://ogranicbio.space/curriculum_vitae_sample_format_in_nigeriacz6rv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_60012ac963dc5.pdfIn PDF document text
    • http://mstmail.space/42580728527ri6k0.pdfIn PDF document text
    • http://givimemaregudum.sportsontheweb.net/miocardiopatia_dilatada_chagasica.pdfIn PDF document text
    • http://abwaab.su/zakigewobozepczmc7.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/88519884642urkru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_605d7e327767d.pdfIn PDF document text
    • http://24goodstore.site/what_foods_can_you_eat_on_a_cardiac_diet6jk2w.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/24763506489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470035/normal_6000b26856931.pdfIn PDF document text
    • http://kvyovk.xyz/vefibafujekasabhxwe8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5fc57003c5db3.pdfIn PDF document text
    • http://copyright-infringement.business/kiluvevolovuluwefuvotewm14c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5ff80f6ee8f93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488582/normal_5fe26442e4b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_601d4f1e426f0.pdfIn PDF document text
    • http://netewe5.xyz/free_easy_piano_sheet_music_moonlight_sonataog964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_601391fd2f3cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_603404e896c03.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/farowug/gidivow.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/miwatoxasuxemejabu.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/samsung_vrt_washer_filter_location_top_loader.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/why_my_washer_wont_drain_and_spin.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/annadata_bengali_movie_free.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_off00011c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C22 5984 bytes
SHA-256: 030126f04ce9359a0c74e949890e4445abc16c08587b885b1ae83e631c3a9107
font_01_sfnt_off000130aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 11880 bytes
SHA-256: 5979dfcae7e84fdedb5289cad1eec29ba088714e13ac17ecdb1613a8a5eac843

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