Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfa6463ad873950…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 18:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5cd156852a8fa84022837fab2917152d SHA-1: 28cdca11733ca74d9000f3fc24cb106fa5d94579 SHA-256: 2cfa6463ad873950dcc5c347016aadd0edd577790b5a461beb29907d28432a12
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a malicious redirector and a phishing lure, specifically linking to 'dafemum.ru'. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs, particularly the primary redirector, are the highest priority IOCs. No scripts were extracted, but the PDF structure itself facilitates the phishing attack.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dafemum.ru/award?keyword=traumatologia+y+ortopedia+definicion+pdf In PDF document text
    • https://cdn.sqhk.co/rawatajizefu/ggjbhgv/cardinal_and_ordinal_utility_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/Sibiil1/92904271897.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/ijgfggA/78318451700.pdfIn PDF document text
    • http://kupivse.xyz/how_to_use_protein_shake_cupr207x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382953/normal_5fe11b680cce8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485446/normal_5fdebdda5cd09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5fd376a3cacbd.pdfIn PDF document text
    • http://nesobaka7.xyz/sexazisezadotipazy0e7.pdfIn PDF document text
    • http://tegor.xyz/76966128123t0pgc.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/IhgswG0/78205802168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_6043483fa15f5.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/mogedozara/39516095062.pdfIn PDF document text
    • http://riwusuka.epizy.com/the_secret_life_of_pets_2_full_movie_online_subtitrat_in_romana.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/90101138805.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/kumesitavuduvutawinexew.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/star_wars_saga_edition_character_sheet_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/kefabalilizapujivovipu.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/drivers_ed_course_test_questions_and_answers.pdfIn PDF document text
    • http://jafutalamisa.rf.gd/sample_introduction_for_monthly_accomplishment_report.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/wejizizaf.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/autodesk_viewer_convert_to.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/gizupagobenirixera.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_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 5348 bytes
SHA-256: a9fd84abe4263a805422a69fb291fc506cc06403f91b8de63b76f87f44d0a5b6
font_01_sfnt_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 11300 bytes
SHA-256: 01d8bf2d7089e4f40b192c9852a3df79e9b2fa36087c923a4be8493fa2310c3e

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