Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a2911f008af4d8…

MALICIOUS

PDF

77.7 KB Created: 2021-03-29 18:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7e4f668051396acf91c703c9419e5190 SHA-1: 4de11f105b91168d2c5caa30a34d5e702e15a8dd SHA-256: f5a2911f008af4d89424a0983fcfd93b279fef129c90288ab4a8b7e744e24c7b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of embedded URLs, many pointing to unknown or suspicious domains, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/wix?keyword=chemistry+solubility+curves+worksheet+answers PDF link annotation
    • http://trikotoria.ru/58140196000r663s.pdfIn PDF document text
    • http://sfhgfje5df.xyz/3116880026q5lmb.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/98009263270.pdfIn PDF document text
    • http://copyrightviolationcenters.com/kujanowevejegaph6t5m.pdfIn PDF document text
    • http://solent.bar/peg_perego_gator_battery_locationqyc4l.pdfIn PDF document text
    • http://vikunokanafigul.66ghz.com/elevation_worship_at_midnight_album.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/kalobiwozorenojuguvuvero.pdfIn PDF document text
    • http://xadimilok.iblogger.org/64986157310.pdfIn PDF document text
    • http://newyearshop.site/defulagupidetapipunemivumc2zi2.pdfIn PDF document text
    • http://form-copyrightservices.com/werupinibixezuvepo6dfd.pdfIn PDF document text
    • http://the-glow.ru/conti_shop_empleadosin4fz.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/cf7c92a0-4eae-4255-99c7-50354187e5a1/hunter_ceiling_fan_remote_control_does_not_work.pdfIn PDF document text
    • http://forezepolutaju.onlinewebshop.net/did_hera_ever_leave_zeus.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_4c5db3e0084e48a48ff1cb45064e4e6d.pdf?index=trueIn PDF document text
    • http://roxujewov.myartsonline.com/63093729278.pdfIn PDF document text
    • http://dalotidel.epizy.com/brown_recluse_spider_pictures_and_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d935219-4e54-4d2a-88fd-42a046eea784/ralejizibategolarariwij.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_9f3bf216c31840d19fa26a696a0880ff.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_82e41703c54944279d9e7993eac38d75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77bbaa5d-9232-4620-92f5-83f3baa39432/how_to_reset_asus_ac3200.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_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 5400 bytes
SHA-256: d5d51a4d239214d6cf2adef11543ea44e9799a9f31ffbce48fddce278be3454d
font_01_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 10312 bytes
SHA-256: 5c63aec45b709e402e191ea064d92b5da54b492b6258e8cbe37eb8a5dd4740cb

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