Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78164fa9daf4b00…

MALICIOUS

PDF

81.9 KB Created: 2021-02-15 02:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5896d59c890911cea2150d8190706c94 SHA-1: 69ee95021e7202c4c7a98fc8cc3360ae88576247 SHA-256: d78164fa9daf4b00e03245c7d3122c93fdcee83cf847442520f89e4b5283c03e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and an ML classifier also flagged the file as malicious. The presence of embedded URLs and the nature of the heuristics suggest the PDF's primary purpose is to redirect users to potentially malicious external content, aligning with a phishing or malware distribution attack pattern.

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://baarspo.ru/wix?keyword=terraria+thorium+ranged+guide PDF link annotation
    • http://emirofficialzm.com/alone_nico_collins_lyrics_1_hourvquxg.pdfIn PDF document text
    • http://weinmvc.net/digital_marketing_job_interview_questions_and_answerscq2mf.pdfIn PDF document text
    • http://alex-chekalev.com/87981425440y9u9v.pdfIn PDF document text
    • http://virnet77.ru/talktalk_broadband_setup_guide6gk9a.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/diggiiB/does_cold_coffee_increase_blood_pressure.pdfIn PDF document text
    • http://sweetmeet.online/kepefowuzozevomesonoben2luy.pdfIn PDF document text
    • https://cdn.sqhk.co/kadefowuvun/dMlif2r/66619151637.pdfIn PDF document text
    • http://expressday.online/airplay_receiver_android_tvxi9ou.pdfIn PDF document text
    • https://cdn.sqhk.co/xupasutejos/fmIibRt/degefuzasapama.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/6I1nicx/28713585956.pdfIn PDF document text
    • http://top-odejda.com/epoc_causas_sintomas_y_tratamientopdrmu.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/jibgchc/pandora_x_star_wars_mexico.pdfIn PDF document text
    • http://lnstagram-office.com/cyber_dragon_duel_links9l0if.pdfIn PDF document text
    • http://lifeeuro.info/jajokozisakivijzlswj.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/N45MhfE/35189031987.pdfIn PDF document text
    • http://mnogoturov.com/galumosoxovaju9fblk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fomidofuwonuw.rf.gd/formal_commands_spanishdict.pdfIn PDF document text
    • http://zufarelizija.epizy.com/61558360205.pdfIn PDF document text
    • http://fasokefukolu.epizy.com/skype_launcher_old_version.pdfIn PDF document text
    • http://worurekebisur.rf.gd/data_analyzer_app.pdfIn PDF document text
    • http://woxowezev.rf.gd/belarus_embassy_visa_application_form.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_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 4980 bytes
SHA-256: 5e22eb463fb7b4cc081883b1c1c132fd08cab76da0c22b14e71c1bf0c61c0567
font_01_sfnt_off000113dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DC 11784 bytes
SHA-256: 2a123e2668d3dd604d38d53148aee284da6e3859f44ce38814b13e728c9b1aa4

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