Malicious PDF — malware analysis report

Static analysis result for SHA-256 4989bb1e26608da5…

MALICIOUS

PDF

85.2 KB Created: 2021-05-31 18:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0e8ee88d276bff4c630236c319dee0ff SHA-1: cd51e5577cdecf715d9bf26a5abc3dbf3d466335 SHA-256: 4989bb1e26608da516edc372ac370326f58cd72f2978736583988350984dbeab
244 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded links. Several of these links point to known malicious redirectors, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and contains metadata related to PDF generation, but the primary malicious activity appears to be the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=wpf+binding+string+format+datetime In PDF document text
    • https://xejotonevuxujuj.weebly.com/uploads/1/3/1/3/131379732/vogirewewawiwipa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454041/normal_5fcb6d4a463e1.pdfIn PDF document text
    • https://felelitujafi.weebly.com/uploads/1/3/5/3/135392562/sedobojat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382631/normal_5ff53f3e279c1.pdfIn PDF document text
    • https://sobaxijuxoje.weebly.com/uploads/1/3/4/2/134235367/finevinevaxos.pdfIn PDF document text
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/a7caf0da99c7.pdfIn PDF document text
    • https://gosupafitowiru.weebly.com/uploads/1/3/4/6/134673249/5947315.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492555/normal_5ffe640a6014b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d16e85-1378-46c0-bf0a-e5aa10b2ab57/quadratic_inequalities_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9776e3ce-c3ab-489f-af33-58faed42a7e5/97269161596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b89830-083f-4ffc-b25d-bdc722c9ba98/65296851851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08121bb4-fe5c-49c9-8729-294ab217534f/motorola_talkabout_t100_manual_espaol.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144416151/troubleshooting_scansnap_s1300i.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd45b1f-ce34-4ba5-8664-b96e3aeb7cbc/crossword_puzzle_solver_answers_and_solutions.pdfIn PDF document text
    • http://gifavipa.pbworks.com/w/file/fetch/144418737/love_music_ringtone_download_mp3_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e339099c-78bf-4a13-a9f0-09a1891096ec/35588089471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79e9301-835d-4376-9d6c-c21909f1d84d/alimentacion_consciente_suzanne_powell.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144415176/74396735719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a50ee46-165d-45e7-a521-381a3daa5bdc/how_to_average_multiple_percentages_in_excel.pdfIn PDF document text
    • http://fevawigo.pbworks.com/w/file/fetch/144419265/gta_5_download_for_android_apk_and_obb_without_verification.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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 6168 bytes
SHA-256: 57b6f1fc342483a8fb7216e1aa20e10ec92f3db7b3ae37cf754072b069f08e7f
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 5480 bytes
SHA-256: 7bc7994a9557bd616d356c74af60d63d80242337895ed0ceb11d3d280bd598a8
font_02_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 11688 bytes
SHA-256: b8c601960d6f9566242b40d11bbab77d3ef469fc71e7c9b9d2c1be1a98e22a9a
font_03_sfnt_off00013098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13098 16060 bytes
SHA-256: bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d