Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb6fdae1e157470…

MALICIOUS

PDF

79.3 KB Created: 2021-03-28 18:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df93cdc7f6b8337e093fa94b5bb07d81 SHA-1: 14dbd85b1f1553dd9d531b4a813854503ad7780f SHA-256: bbb6fdae1e157470d795034e4b3340c0ff5aaa2a715d97c02f895176b47f8d59
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL pointing to a domain associated with phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://jumiwimov.ru/strik?utm_term=how+to+study+physics+faster
    • https://cdn-cms.f-static.net/uploads/4501645/normal_605d57d105626.pdf
    • http://poopo.ru/42731713811dxakm.pdf
    • https://static.s123-cdn-static.com/uploads/4466135/normal_600696a3ce2af.pdf
    • https://static.s123-cdn-static.com/uploads/4423452/normal_5fff96c8a7436.pdf
    • http://pojapusevipuzu.mypressonline.com/free_printable_list_of_commonly_misspelled_words.pdf
    • http://virujurarajilef.getenjoyment.net/59458391674.pdf
    • http://taxurofetizi.22web.org/vewejoxiwezafekerorel.pdf
    • https://cdn.sqhk.co/vuwibagula/WgdTkij/degafukedegavibego.pdf
    • http://oneitshop.info/protein_synthesis_in_prokaryotesp23i2.pdf
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5feec875f00ad.pdf
    • https://cdn.sqhk.co/ninujamezol/ihhbHzG/usa_network_channel_number.pdf
    • https://cdn-cms.f-static.net/uploads/4471691/normal_604aeb38500fd.pdf
    • https://cdn.sqhk.co/zorezibeb/i534idv/top_likes_for_instagram_photo_splitter_apk.pdf
    • http://ladunosim.sportsontheweb.net/is_there_a_winnipeg_sun_paper_today.pdf
    • http://ritefajitexu.scienceontheweb.net/yuk_belajar_saham_untuk_pemula.pdf
    • http://gajelifuluxapov.mywebcommunity.org/cva_wolf_ss_with_scope.pdf
    • https://cdn-cms.f-static.net/uploads/4498978/normal_605066edc6afd.pdf
    • http://giveaway2020.info/safety_mask_from_virusfpq35.pdf
    • http://jsexj.fun/jiwavebikuxuragamixebujaa2ar1.pdf
    • https://cdn-cms.f-static.net/uploads/4481072/normal_5fd18cd8089d5.pdf
    • https://cdn-cms.f-static.net/uploads/4477910/normal_60545a45c82b0.pdf
    • https://static.s123-cdn-static.com/uploads/4455377/normal_600469122b208.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tabetoge.rf.gd/midnight_sun_book_series.pdf
    • http://mimosomudex.rf.gd/14376799692.pdf
    • http://lifeseven.rf.gd/how_to_connect_bluetooth_panasonic_sc-hc05.pdf
    • http://bobakazof.epizy.com/sixuzokef.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ba.bin
3d1a31828669a1d967e71c066362970422f9321f8d24962f48ad5cc00bbcec5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 5368 bytes
font_01_sfnt_off00010b0e.bin
199250faab4f923e2c8956500556cb7bad16f5caafaabef127d0141fafc2521f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 10776 bytes

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