Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9af7863780efc7…

MALICIOUS

PDF

74.7 KB Created: 2021-01-01 09:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 372bdb1e7ab529e08ed81095b11b0295 SHA-1: bcc22c67fa54850675067bc36d4698a3558ccf1e SHA-256: 8d9af7863780efc707ed9f09b15efe2e0fe48efa5b22909c3077faa5b76ec1c1
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the PDF as a link farm. The ML classifier strongly supports a malicious classification. The presence of numerous PDF links suggests an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=wolfcraft+clamps+australia In PDF document text
    • https://vesifumami.weebly.com/uploads/1/3/5/2/135294942/5849515cc9.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefoveniri/ehfn9ji/to_do_list_checklist_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5fd225df76562.pdfIn PDF document text
    • https://cdn.sqhk.co/gekobegij/2ihgfuL/ant_war_full_game_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481418/normal_5fa934f4d7747.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/jipowumat/fujorevivirovutufokibuk.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/xasumetuto.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/qureshia_work_bed_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/elizabeth_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/adverbial_phrase_worksheet_for_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/canada_visa_application_form_imm5257.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 5176 bytes
SHA-256: 6f7de6f7eccf4d8c871cdd37d07ca53fa4a9c9340755c7feee812d801daf9a0d
font_01_sfnt_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 1852 bytes
SHA-256: 30d16f7417f0add8d0285b648bbaf00e913f8a8b98029eef0ba4a775d80cd2e5
font_02_sfnt_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 10672 bytes
SHA-256: c6a1be421a7d115f4201d9bca6a8dc412fcf85a777e41a4deacb292113e7cdeb
font_03_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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