Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6121acea03cbf8…

MALICIOUS

PDF

76.4 KB Created: 2021-03-09 12:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 12c0db1303d3fe0ba490732f38bd5aca SHA-1: 91850e5f1200effdd8f3fbb3e7f4f9829919b56c SHA-256: 8f6121acea03cbf81bc7b8b45435c92eedee1a66c377440db26e9a09c1889688
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure related to downloading a book, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/award?keyword=a+dozen+a+day+preparatory+book+pdf+free+download PDF link annotation
    • http://7lessons.website/tri_state_bus_to_midwaybzyej.pdfIn PDF document text
    • http://derobidav.iblogger.org/35671478423.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/ajijeQd/jump_on_it_just_dance_3.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/cCTDLgf/podimosezulalovej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457281/normal_6005c96e397b8.pdfIn PDF document text
    • http://gufutaca6.xyz/33275002638nr1dc.pdfIn PDF document text
    • https://berapozi.weebly.com/uploads/1/3/0/7/130776213/3850028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_60342ab18e3a2.pdfIn PDF document text
    • https://vomomojivebaju.weebly.com/uploads/1/3/4/5/134599032/8181024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406812/normal_5fcf81401b0de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482219/normal_5ff6bed6221f7.pdfIn PDF document text
    • http://tasefuvakol.22web.org/scotland_league_1_form_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/h0jggeO/pefebutubopufaf.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/z1vjjii/gumball_games_unblocked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejelinemadagep.rf.gd/bleacher_report_man_united_fifa_19.pdfIn PDF document text
    • http://dolasuwukino.epizy.com/83411185750.pdfIn PDF document text
    • http://dirujuwut.epizy.com/exploding_box_template_svg.pdfIn PDF document text
    • http://refipazak.epizy.com/ergonomics_risk_assessment_template.pdfIn PDF document text
    • http://varupasasadutab.rf.gd/ruximurajewoleda.pdfIn PDF document text
    • http://tegigud.epizy.com/what_is_linguistics_all_about.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_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 5292 bytes
SHA-256: f03b1f819da8ca8c79165185c93bfb46002f6b248f3ba31ac5aeffa9a9621c2e
font_01_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 10736 bytes
SHA-256: c17a8122faacd878057ad7f55c5c8c912df5c05a6438e2422fc24ce07e3d51d4

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