Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf66b547b25ea1c…

MALICIOUS

PDF

73.5 KB Created: 2021-03-31 05:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 82ec6fc32c54049b113dbfd2d5d2b270 SHA-1: 2220b7fd1a119e493e2032bd0f9f0a4f68eb2780 SHA-256: 3cf66b547b25ea1c596a97394570d6cf8744f24daf9976ae7348ee965a2299ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are dynamically generated, suggesting a link farm or phishing attempt. The embedded URLs point to domains commonly associated with malware distribution and phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect the user to malicious content.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/123?utm_term=adobe+premiere+pro+cc+2015 PDF link annotation
    • https://cdn.sqhk.co/jizapamilizo/haif5ha/249350647.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/cu0ghP7/15486815059.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/XkjfhhU/grand_truck_simulator_2_maps_download.pdfIn PDF document text
    • http://nokunejojepeje.22web.org/maintain_automatic_teller_machine_atm_services.pdfIn PDF document text
    • https://cdn.sqhk.co/vonewesipan/jdiibje/cancer_informatics_sage.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/jiwotarotavuz/bonuwakibeviduze.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/which_star_wars_canon_books_to_read.pdfIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_38a49c91aaa54403868746c050ea9d25.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_45f1151bee264bbe9bf1f538d7a4e05f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/jotox.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_3ace3f1d9cdb46c69379e76e68f96339.pdf?index=trueIn PDF document text
    • http://zexeborora.rf.gd/xotedoga.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/lanersbach_snow_report.pdfIn PDF document text
    • http://ziwufuv.rf.gd/csi_300_index_factsheet.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_8911ed30dcaa423a870c2af70c2900c0.pdf?index=trueIn PDF document text
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_fadaeb6f3d674ca9a8e88eb0634a0ea9.pdf?index=trueIn PDF document text
    • http://teruwizirazi.rf.gd/maritime_acronyms_and_abbreviations.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_81b9ac2a27244cdb92846ec5c37b4786.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_1a37cb353a1c4bbbb21015138a5b2fad.pdf?index=trueIn PDF document text
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_bb9157c797c240dbbfef23e941477d82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/91438042935.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_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 5380 bytes
SHA-256: 4010c8dcd3c2007317cd82be116c080486447f16b8afe375018e95fc2751d758
font_01_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 12572 bytes
SHA-256: 8677ae11962d444d1368b2bca2224f4412d913e9aa4910d0c9ec8c4559c4c7a9

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