Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83385a9efef83e7…

MALICIOUS

PDF

86.8 KB Created: 2021-03-01 02:57:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e4ee417d98c130c971c2296a884e44af SHA-1: 5cc95ceaedc68d79998e0cda56c33d2b85d0f1ef SHA-256: a83385a9efef83e7675fe5b3e42996c85f14801a41775aa5a206795dbdd44ef9
134 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to link farms hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure for an ebook, likely a pretext for directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/wix?keyword=dr+david+pearson+diabetes+free+ebook PDF link annotation
    • http://jevopapivixepe.iblogger.org/19517714268.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/1984_study_guide_answers_part_2.pdfIn PDF document text
    • http://jujibej.iblogger.org/gloria_victis_new_player_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460055/normal_5fe245b8b7430.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/sejilepanitiralalopuevyxi.pdfIn PDF document text
    • http://gesitaxipuvav.22web.org/libro_azul_2015_autos_gratis.pdfIn PDF document text
    • http://spiritstudio.ru/zubuzusimisidekuy5l3k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421629/normal_5fe892ee2f6e7.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/what_has_the_least_calories_at_dunkin_donuts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_603bbd1a145e7.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/dragon_age_origins_romance_sten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_6018ad8ac5898.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/bisamiralepijagekom.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/proper_care_and_feeding_of_marriage_summary.pdfIn PDF document text
    • http://lnstagramsecurity.net/change_background_color_android_browserxe356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_603bf27143619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavatesivo.myartsonline.com/how_to_increase_height_1_inch_in_a_week.pdfIn PDF document text
    • http://taxavotafeveb.epizy.com/certified_letter_from_former_employer.pdfIn PDF document text
    • http://bovifuxabobi.epizy.com/59431029987.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/college_algebra_word_problems_solver.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_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 5264 bytes
SHA-256: d2c787f589ead55d732124227de8423cddeb46e578842915dc7e93b3efbb336a
font_01_sfnt_off000126a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 11340 bytes
SHA-256: daa900d272dc30946a3d3b477a596a2f5e79bfb05a4240750aec40b355c6fb24

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