Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2f83fde9c87683…

MALICIOUS

PDF

73.3 KB Created: 2021-01-18 16:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 21e95872eb6b77fccd2f9217d59995a1 SHA-1: 2739cc3046c12ff29926f25f2eb37497f5d0eaad SHA-256: 2f2f83fde9c876834a0110e052c06391448de7d7f0d49ea87e54418ebe771ad0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as book-related content, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs point to potentially malicious content, and the PDF structure itself is flagged for suspicious link farming.

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://jacksth.ru/wb?keyword=the%20tiger%20rising%20book%20online PDF link annotation
    • https://cdn.sqhk.co/govizanorev/hc3Ltgc/smartwool_socks_sale_nz.pdfIn PDF document text
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/59aae40.pdfIn PDF document text
    • https://site-1252766.mozfiles.com/files/1252766/tmux_shortcuts_cheat_sheet.pdfIn PDF document text
    • https://site-1177655.mozfiles.com/files/1177655/vebowonal.pdfIn PDF document text
    • https://site-1173528.mozfiles.com/files/1173528/tipixutarefotiralotezaf.pdfIn PDF document text
    • https://site-1199244.mozfiles.com/files/1199244/4998657260.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/lulelepese/mimipulorib.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/vatemibukubelabiletok.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/wow_vanilla_tailoring_enchanting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/zte_maven_3_sim_card.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/game_website_template_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/sunurujijupumavedisakubi.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/better_world_books_donation_guidelines.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_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 4888 bytes
SHA-256: 1e48ac479de04d2cc639aaea7e62a48331c9f2353e161872cfc3ff3b70a158d4
font_01_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 10300 bytes
SHA-256: af05f225c03fe592426f9175797dfc94a2202e2254344c5cde78f607ca793f16

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