Malicious PDF — malware analysis report

Static analysis result for SHA-256 882c4520807b0eed…

MALICIOUS

PDF

82.6 KB Created: 2021-03-24 01:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4ad6a83444204ce5334ccc3544b86fab SHA-1: 5110e4e2d184769e0294228eb9d92a5c5711b053 SHA-256: 882c4520807b0eede036d8979efdcf3d7bc54a3e2cf63285ddc1df0637663a43
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kuzutuzo.ru/strik?utm_term=bear+archery+vast+rth+review PDF link annotation
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/58b9942fbde2efe.pdfIn PDF document text
    • http://sluzhba1.net/synonym_worksheet_for_grade_318iu8.pdfIn PDF document text
    • http://getchambre.xyz/swann_camera_dvr_password_resetyirfs.pdfIn PDF document text
    • http://rubka.space/emma_jane_austen_character_analysiskqab5.pdfIn PDF document text
    • http://wuzejava.22web.org/guidelines_on_vertical_restraints.pdfIn PDF document text
    • http://timogefubor.22web.org/26590051927.pdfIn PDF document text
    • http://mamontov-net.cc/easy_christmas_medley_piano_sheet_musiceig3h.pdfIn PDF document text
    • http://sejapamuji.22web.org/acer_chromebook_15.6_charger.pdfIn PDF document text
    • http://prostotit.site/xarodujapijepiwijviqo1.pdfIn PDF document text
    • http://stickerrus.ru/128194044547090v.pdfIn PDF document text
    • https://wimitefadekox.weebly.com/uploads/1/3/4/5/134586198/futix.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/tidigudetefumof/vajototaboxugutotogi.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/informazioni_catastali_significato.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/wivabilufuturavagu.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/84000278623.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_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 5160 bytes
SHA-256: 6d5eaa9698ef1d5950272378ed72b498e801e4a39799a0d1023647e12b2a978a
font_01_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 11304 bytes
SHA-256: 0e9bf74c8cb981b673c11feb1d7421972290ebd0b6ac08fd51470353f5fcd114

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