Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb3fee5e5c6f108…

MALICIOUS

PDF

86.1 KB Created: 2021-02-25 16:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c24f6cc66c5d1e8387e75cf59fb59105 SHA-1: f8a1396a003a6ff856c0345204fa8ee829189a8c SHA-256: dcb3fee5e5c6f108e133ab67d1ef103507b34cbbb4b41d3c559755e62eb3feab
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains keywords related to guides and awards, which are common lures. The presence of numerous external URLs indicates an attempt to redirect users to potentially malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/award?keyword=5e+elemental+monk+guide PDF link annotation
    • http://zutatowatipo.mywebcommunity.org/bissell_big_green_professional_carpet_cleaner_machine_rental.pdfIn PDF document text
    • http://bizarur.iblogger.org/ada_easd_2015_guidelines_ppt.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/how_to_negotiate_a_car_lease_payment.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/30982635153.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/66892576341.pdfIn PDF document text
    • https://zimosamizafokox.weebly.com/uploads/1/3/6/0/136091721/xageweza-vepipotiwe-xujix.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/juwijagajarukeji.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/22558407546.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwodapasolok.rf.gd/61069517316.pdfIn PDF document text
    • http://winavetipi.epizy.com/35060561854.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/71034559787.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/datorukadanokaxodeli.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/35357789660.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/fallout_4_companions_reactions.pdfIn PDF document text
    • http://pepajefosub.epizy.com/addiction_severity_index.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/video_er_app_iphone_free.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/rival_ice_cream_maker_walmart.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/learn_arabic_for_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/define_mergers_and_acquisitions.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/1500_frases_mas_usadas_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/boomtown_movie_parents_guide.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_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 4964 bytes
SHA-256: 6a598bf93ae26cb9b1f023d0725fb4c3fe25e8ddc3096d2a4c100b46fab400c0
font_01_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 10196 bytes
SHA-256: 57048125940031534c560cba65aae6ba143de4638d5ef5643de4ba4f891a3e05

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