Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dd4e5b813fa277…

MALICIOUS

PDF

82.3 KB Created: 2021-05-04 12:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f536a5d63d2c6fad68725250ef99b18f SHA-1: ecc7e687d62bb5cf784ffd096a3b4af8deb68fd2 SHA-256: 97dd4e5b813fa2778b5c27c9085f3e06ad4ef9f64d08494f83a05730b9d5d230
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, with a high density of links to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The embedded URLs, such as 'https://golowaki.ru/strik?utm_term=are+cardboard+boxes+flammable', are likely used to redirect users to malicious sites for further exploitation.

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://golowaki.ru/strik?utm_term=are+cardboard+boxes+flammable PDF link annotation
    • https://vixekilawuta.weebly.com/uploads/1/3/4/3/134305586/cab36e9c.pdfIn PDF document text
    • http://arendagg.xyz/foxit_printer_windows_10y8e46.pdfIn PDF document text
    • http://gukevipagopu.mywebcommunity.org/jozaw.pdfIn PDF document text
    • http://hookup153.fun/montaigne_denemelerzusoo.pdfIn PDF document text
    • http://steh-sistem.ru/how_much_is_steve_hilton_worthhlmti.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/vaderadunivipupogoteda.pdfIn PDF document text
    • http://shoplus.info/paint_by_numbers_framed_canvas_ukn0bya.pdfIn PDF document text
    • http://good-production20.site/kemetoretizomikigotbfh3g.pdfIn PDF document text
    • https://zikagegivexu.weebly.com/uploads/1/3/4/5/134527251/jugasubotejumilu.pdfIn PDF document text
    • https://jobugatiponez.weebly.com/uploads/1/3/4/2/134234820/leradazuka.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/jufowokedunod/fallout_tactics_unarmed_guide.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_cb222c60c5b94e479fe776422977a6a0.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_e49de1c0e9ee41f68865ba021994e846.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuzamada/css_blur_filter_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/80087359049.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/18543879888.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_a551cfbd92d34d25b48687c43a4e93a3.pdf?index=trueIn PDF document text
    • https://52aa71f3-9574-4e96-898b-bb16aa893b2c.filesusr.com/ugd/b13a71_5f174f94ad9342abaccc756256d5625d.pdf?index=trueIn PDF document text
    • http://pabotojixupi.atwebpages.com/vedic_astrology_horoscope_dates.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/how_to_use_video_on_nikon_d800.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/mdr_zx770bn_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/boworu.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_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 5364 bytes
SHA-256: 84b85a16dbf99220a858dc7485de882d7a915f52f0e74fc987a187899085c4ca
font_01_sfnt_off0001161b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161B 11096 bytes
SHA-256: 3508d6b13301b345fa0970c4f19e4ba770305d650fdb5be186ad019d4e729c3a

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