Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c995a25fd96a9b…

MALICIOUS

PDF

80.2 KB Created: 2021-03-11 14:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bbaac1d67a3a3739790c20079925d585 SHA-1: 594677629db880aeb1be80a146f191273becaa27 SHA-256: 59c995a25fd96a9bdc282f5f27824b7332e87b0c80fdd7e8ebfe6500abfed244
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with several pointing to potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://vilenefex.ru/123?utm_term=sqlite+database+browser+for+android+studio PDF link annotation
    • http://rorogudadusosej.getenjoyment.net/linux_awk_manual.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/the_banking_concept_of_education_rhetorical_analysis.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/35106752530.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/kibizob.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/koduvedoramavituzimuz.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/kanixojifem.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/is_superior_spider_man_in_earth_616.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/what_are_the_three_purposes_of_punishment.pdfIn PDF document text
    • http://zigapajuxijado.mywebcommunity.org/faxolukasogelixorerokoza.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/jawuw.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/55888557083.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/xapijifas/cybex_exercise_bike_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/livalukijavuzexetopo.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/14502679336.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/58939484993.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/pedosevilom.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_760c413fafa64e0f98bb1966f0c7a3ec.pdf?index=trueIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_6eae92e12b5b4eb4bcf53586f4ff2c16.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_09aa5a774e3b4c4c8639486ef1d05be3.pdf?index=trueIn PDF document text
    • http://jibimom.myartsonline.com/when_was_my_glenfield_model_60_made.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/migarujigemav.pdfIn PDF document text
    • http://femagela.myartsonline.com/usmle_first_aid_2015_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/vudupitugemenokobodij.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_d2286dcaba444ea8abe9b34cfcf0a543.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safago/christmas_violin_and_cello_sheet_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 5360 bytes
SHA-256: 997bc3a8dd2c3d5478d1eeaf83fd564a137e478a12583bae43461144f490d146
font_01_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 11180 bytes
SHA-256: 70bda0268581cddb7b80dee865d712a6cf57b63fe0d620943a8501eb7c046e99

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