Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c24171ec162772…

MALICIOUS

PDF

78.2 KB Created: 2021-03-01 01:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b8d68ca2b46b64604a2ea02ac5ecde0e SHA-1: 699562bba996da01edc147e4f17f0ede47f077bf SHA-256: 82c24171ec162772b50df2a2161a5ac79b414d8e971e07804179c281bb2b456b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a URL that aligns with the identified attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=the+undoing+finale+review+guardian PDF link annotation
    • https://cdn.sqhk.co/juzexokogim/jbxxhwm/jimikifab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496586/normal_5ff7acf8cb52f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470980/normal_5fcb7b839ad5c.pdfIn PDF document text
    • http://subfamjtii.site/pexezcjhhj.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/pre_post_test_comparison_statistics.pdfIn PDF document text
    • http://lavka-karamel.ru/zoresevokagiforw6s2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_5fc80285e4aed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501777/normal_600f5978e4d30.pdfIn PDF document text
    • http://weraka.online/mansions_of_madness_second_edition_scenarios_rankedgvt1c.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/flight_simulator_games_for_xbox_one_x.pdfIn PDF document text
    • https://cdn.sqhk.co/rujoremebi/tyhhc1v/hawaii_pogs_value.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/city_of_bones_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/ha28igH/tron_legacy_light_cycle_real_life.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/Hv1I1jf/15951994253.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tasifomarefid.rf.gd/ps_vita_cheapest_price.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/55218385373.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/java_j2ee_interview_questions_and_answers_for_10_years_experience.pdfIn PDF document text
    • http://daxotumolurotaw.rf.gd/38534437214.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_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 5092 bytes
SHA-256: 5bd8394eec29e0b29250f19a753c865ad0b87f24db35167057e78f93788a72f5
font_01_sfnt_off00010775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 10656 bytes
SHA-256: 1b3591d03a2eee419d9c91601b8c7ba528edf1bfb69e14449abf50a80ed86a2b

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