Malicious PDF — malware analysis report

Static analysis result for SHA-256 535c463f6f522287…

MALICIOUS

PDF

75.8 KB Created: 2021-03-15 14:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 95bb3481912b5d33cdd9a21e7790d4db SHA-1: b52aeb1efa43251bc9092eadcaf80b372843d609 SHA-256: 535c463f6f52228750fc874da99a2f9dc44f02069ea8e32696d72cc161f977b0
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is flagged as a potential phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the overall structure and embedded URI suggest a phishing or malware delivery attempt.

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://vilenefex.ru/wix?keyword=soul+without+shame+pdf PDF link annotation
    • http://reloturuvum.22web.org/16014141441.pdfIn PDF document text
    • http://xonibiz.22web.org/solids_liquids_and_gases_worksheets_grade_3.pdfIn PDF document text
    • http://braco.ru/414999650175i3sj.pdfIn PDF document text
    • http://wurigebabisu.iblogger.org/gazavakawijapetorusuwaki.pdfIn PDF document text
    • http://uorott.com/english_grammar_test_intermediateo8k42.pdfIn PDF document text
    • http://huseyincanx.com/best_way_to_start_tai_chi2g3ex.pdfIn PDF document text
    • http://bejegom.22web.org/95457323191.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/gotenukevepunin/16005590569.pdfIn PDF document text
    • http://dexixikix.epizy.com/brain_games_in_tamil_free.pdfIn PDF document text
    • https://835e8637-c19e-4787-b354-697c3ebd04b7.filesusr.com/ugd/c068f8_86b9daa984bf4495bd91ebb9c2873035.pdf?index=trueIn PDF document text
    • http://davaroka.rf.gd/jerugapisidibidetab.pdfIn PDF document text
    • http://ralodanuf.rf.gd/73816975024.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/fazeg.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_dc5f383a2b0c4d4bbfba04330f381f1b.pdf?index=trueIn PDF document text
    • http://kedadav.rf.gd/where_are_contour_next_test_strips_made.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/how_do_you_use_self_clean_on_ge_oven.pdfIn PDF document text
    • http://laneneloko.epizy.com/20018619111.pdfIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_925c7b57223c494d87ad9643a409f0d3.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_0a77b306ee9d4cdeb061c134654bbfb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/backchina_app_for_android.pdfIn PDF document text
    • http://vuropomap.epizy.com/cafeteria_plan_advisors_form.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_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 5380 bytes
SHA-256: 0a052537524018a924f0123323ba9729f925741fa8d6cf96fee8042ad7107ec3
font_01_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 11848 bytes
SHA-256: 5019bc77c307c7baca9091e95b24279435ec5a9ac9d0ea7185f4cf103856d007

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