Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3823b7a8896ea34…

MALICIOUS

PDF

83.0 KB Created: 2021-04-23 18:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ab24ebe170818851a4e136402c4e2ae3 SHA-1: ec88dfe72819bd1162ccb8a90efe2f160db651df SHA-256: a3823b7a8896ea348cc7adce35efbf2dfbca714b239347d08cb2b84246146572
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution vehicle. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. One prominent URL, 'https://xajibur.ru/strik?utm_term=can+you+use+single+quotes+for+emphasis', appears to be a primary lure. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware delivery attempt.

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://xajibur.ru/strik?utm_term=can+you+use+single+quotes+for+emphasis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421205/normal_6054304c44244.pdfIn PDF document text
    • http://potenciy.xyz/rajojuguzilew69jbr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_600f9ffa38835.pdfIn PDF document text
    • http://pitushok.space/prometheus_unbound_analysisyh5we.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413563/normal_5ff8940bc178e.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/9e37338.pdfIn PDF document text
    • https://jikevisanudopud.weebly.com/uploads/1/3/4/0/134017539/xetugubaguwovo_jevab_gimufepil_gojazasemari.pdfIn PDF document text
    • http://sazijanisa.22web.org/canon_g7x_mark_ii_manual_download.pdfIn PDF document text
    • http://svoylend.xyz/jolurowanefiwokemedekakaw34eoy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_602b474d0263d.pdfIn PDF document text
    • https://wumotupukivu.weebly.com/uploads/1/3/4/5/134525371/7ab54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://likijanima.epizy.com/cannondale_mtb_sizing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a987d0f7-926b-4318-9456-ea7498102a81/leo_new_moon_2020_time.pdfIn PDF document text
    • http://gafiworajosolaf.rf.gd/xinexomolenitume.pdfIn PDF document text
    • http://mevuzulutifoxa.rf.gd/how_to_enable_shortcut_keys_in_photoshop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1901a2d0-038d-485b-8ebf-1b6acac61101/summer_infant_video_monitor_2010_manual.pdfIn PDF document text
    • http://dobejevilorizu.epizy.com/jet_cell_phone_insurance_claim_form.pdfIn PDF document text
    • http://xonafalapon.epizy.com/maguxaguwane.pdfIn PDF document text
    • http://kedukukixef.epizy.com/87378323418.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 5448 bytes
SHA-256: 0398a06b5e533a9f74ab26047afa86337e7f38c496968c4fb640c24bd729de93
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 10956 bytes
SHA-256: 719bdcdd142f687f210531d80a3b93ca49841eaa6474179786b59e1718795002
font_02_sfnt_off000130a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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