Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3084566b00c2107…

MALICIOUS

PDF

82.1 KB Created: 2021-02-18 15:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fba81373623349ef00e2d7e8aac316e5 SHA-1: 6c6b914f899ed8fd11146d235ec35d0f931cf803 SHA-256: c3084566b00c2107f7f546d153d504968e85751672c068f9f1341a1b70098a95
184 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the numerous embedded URLs, many on disposable domains or known malicious redirectors, indicate a phishing or scam campaign. The presence of embedded JavaScript, though not explicitly detailed, further supports malicious intent, likely for executing further malicious actions or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://crophysi.ru/strik?utm_term=motorola+xpr+6550+out+of+range In PDF document text
    • https://cdn.sqhk.co/lilodipu/jdP4ibR/skillz_logical_brain_game_cheats.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/528e16dbda.pdfIn PDF document text
    • http://cleaner-inn.club/xutexefuwisizomatuxq5j6l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413109/normal_5fd3a3ffe90d3.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxarabo/faiiieL/wwii_zombies_survival_world_war_horror_story.pdfIn PDF document text
    • http://milanomoda-italy.site/36622663839sur3j.pdfIn PDF document text
    • https://falaxejuwutop.weebly.com/uploads/1/3/2/6/132681153/4578896.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470836/normal_5fc752ecbd201.pdfIn PDF document text
    • http://avto-trokot.xyz/home_assistant_icon_color_templateg3966.pdfIn PDF document text
    • http://fridgeservice.ru/crash_course_ap_psychology_worksheetswa9lt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_6013f0da7a875.pdfIn PDF document text
    • http://esmoney.site/melogitevancdtl.pdfIn PDF document text
    • http://texukajiz.iblogger.org/how_do_you_use_a_campbell_hausfeld_air_compressor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471704/normal_6023e0a0609ff.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/safenalavojuwu/fenob.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/solid_figures_worksheets_for_grade_1.pdfIn PDF document text
    • http://basufalutu.epizy.com/nosanisufiritavanajejax.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/3579470929.pdfIn PDF document text
    • http://wipovevoliku.epizy.com/ginujudolija.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_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 5384 bytes
SHA-256: 47a78d8aa4ba6a36269a7fc8048b064f8d1ed8ace7f00574e05f7cb4666c8d1b
font_01_sfnt_off000116c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 10888 bytes
SHA-256: 3c7f9dd26bf1ff2cc26a394df2cbd39966ff64b8afc631f696aa80f77c7e884d

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