Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9fc6405c7f64b3…

MALICIOUS

PDF

79.2 KB Created: 2021-03-26 09:38:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8d7f12c94580398efeb594513b0450dd SHA-1: 7e0be72f5a43c2c068dfd44f67119a130d000e77 SHA-256: 0a9fc6405c7f64b314d219931c919386da763827c2514d29d7d5e95eef7aa3de
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'xezojet.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to 'learning' and 'answers', likely a lure.

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://xezojetit.ru/wix?keyword=castle+learning+answers+earth+science PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391624/normal_603f0063e5d5b.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwevini/fGAhbcQ/voromozidulugaviwilugerit.pdfIn PDF document text
    • http://simcars.ru/jarvis_for_mac_download0rxlj.pdfIn PDF document text
    • http://dimax-matrasy.ru/kugefaluj3kl6.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/jcyghif/kivugow.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/fEjjIhi/tiny_house_builder_colorado_springs.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/zggjhWj/pen_and_paper_rpg_systems.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_602b707d7799c.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/cjeJOgj/vebamurifefimatugelorat.pdfIn PDF document text
    • http://dom-bita.org/what_does_write_a_one_page_reflection_meangr3sq.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/jhjifhd/tadob.pdfIn PDF document text
    • http://shtangye.xyz/epson_wf_2630_sublimation_reviewf9nxm.pdfIn PDF document text
    • https://cdn.sqhk.co/duwefetufe/jjhjhe5/62105701137.pdfIn PDF document text
    • http://matroskin.space/liverpool_real_madrid_2009_formazionip493w.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/dcaed2eb-b509-492f-9241-b57e565594bc/12_step_guide_to_using_the_aa_big_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578ad7c9-9100-4b44-a159-5769c1184bf2/number_the_stars_chapter_6_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5486422-0598-414e-87aa-14ae22db7a3d/mimamiposi.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_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 5056 bytes
SHA-256: 582b9c6ac0f629d0cabf61b2a17a381a5bfdbf09c06bf15c5d4589776c2d9951
font_01_sfnt_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 10452 bytes
SHA-256: c317dbf1f167f9565714b3f9db5c87a70c47a6108344bcc77f6905d08425dfc8

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