Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b372274aaf42ff6…

MALICIOUS

PDF

74.6 KB Created: 2021-02-13 08:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ec5a71c0754f5c9c1ed2ace444937b93 SHA-1: 084794badd37858786faa9ce42aaf68a93827f07 SHA-256: 9b372274aaf42ff60254a68f698d4376cbd6978a12ff412cdbbdc48b99e4ea64
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a PDF redirector and a link farm. The numerous embedded URLs, many hosted on disposable domains, strongly suggest a phishing or redirection campaign. The presence of a link to known malicious infrastructure further supports this assessment.

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
  • 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/123?utm_term=third+person+subjective+definition In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366989/normal_5ffc8ffd64349.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443598/normal_5fdff0a466670.pdfIn PDF document text
    • http://jevufoduxixan.22web.org/gowiraselulako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_602189324e900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fd37cb1567c4.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/BidhcMU/teramoxaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_600a4e8d1269b.pdfIn PDF document text
    • http://jigunemav.22web.org/pictographs_worksheets_5th_grade.pdfIn PDF document text
    • http://vixesun.iblogger.org/movie_waiting_for_spring_sub_indo.pdfIn PDF document text
    • http://zidujuwus.iblogger.org/437323046.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/uOiaiaa/my_club_application_egypt.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/gfnSljf/7813702008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5fd060fde32d8.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/gfgg4ja/1725862672.pdfIn PDF document text
    • http://sojarenenu.iblogger.org/gazojofurubon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maxegore.epizy.com/58095943930.pdfIn PDF document text
    • http://wejanofe.rf.gd/free_avast_antivirus_64_bit.pdfIn PDF document text
    • http://ruxomipeb.epizy.com/84438707898.pdfIn PDF document text
    • http://tosopipates.epizy.com/incident_report_template_for_child_care.pdfIn PDF document text
    • http://mixonanax.epizy.com/live_video_call_software_free.pdfIn PDF document text
    • http://gojexigubobe.epizy.com/autonomic_and_somatic_nervous_system.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_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 5228 bytes
SHA-256: 564a1fa04172bdd3bed7ece6cd3a34cb00834ccad9a7767cd2403a69ef3196f5
font_01_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 10836 bytes
SHA-256: e133b269726447184ef4eac4c424dd18ce8a5a3dbf0c1e284fb9560a05b84e22

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