Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdb7338760f1a5a…

MALICIOUS

PDF

84.4 KB Created: 2021-03-01 09:30:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 18749598a286d95bb7da77f96cd9738b SHA-1: 6b2bfd8b8a521fa7e30244560d66afab61369648 SHA-256: 3cdb7338760f1a5a9a94942da897a14a43c66cf785cdf42e2658a731924d98d1
214 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains references to generators and technical terms, possibly as a lure. No scripts were extracted from this sample, but the presence of numerous external links suggests an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/award?keyword=how+to+start+generac+5000+watt+generator In PDF document text
    • http://zabemaladameg.medianewsonline.com/what_is_feminist_literature.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/26070577927.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/iha7Mjg/godebisufiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/ghhgd8y/46440896398.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/top_25_machine_learning_startups_to_watch_in_2020.pdfIn PDF document text
    • https://vasiwamalag.weebly.com/uploads/1/3/4/0/134012587/7fbe66786562.pdfIn PDF document text
    • https://cdn.sqhk.co/mebosuxular/UhajjPq/generalized_impulse_response_function_matlab_code.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/Egcfify/smash_mouth_sturgis_hate_mail.pdfIn PDF document text
    • https://peliwotamo.weebly.com/uploads/1/3/5/3/135325711/c8d8d0352.pdfIn PDF document text
    • http://idclick.cash/parquet_vs_json_performance8pzgv.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/what_is_another_name_for_narrative_song.pdfIn PDF document text
    • http://lishop.site/bartolinitis_aguda_tratamiento2xfzz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_60149fdd72849.pdfIn PDF document text
    • http:///\\\/twitter.com\\\/GeneratorsDirec\,\icon\:\icon-twitter\,\title\:\Twitter\},\Pinterest\In PDF document text
    • http:///\\\/pinterest.com\\\/generatorsdirec\\\/\,\icon\:\icon-pinterest\,\title\:\Pinterest\},\YouTube\:{\href\:\https:\\\/\\\/www.youtube.com\\\/user\\\/ElectricGenerators\\\/\,\icon\:\icon-youtube\,\title\:\YouTube\},\Instagram\:{\href\:\https:\\\/\\\/www.instagram.com\\\/powerequipmentdirect\\\/\,\icon\:\icon-instagram\,\title\:\Instagram\},\LinkedIn\In PDF document text
    • http:///\/www.bbb.org\/chicago\/business-reviews\/industrial-equipment-and-supplies\/power-equipment-direct-in-bolingbrook-il-57001088,title:ElectricIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vokeri/17071820722.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/acknowledgement_for_a_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/jererazumujovu.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/autocad_2011_free_softonic.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/fexigezapidupulinim.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_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 5256 bytes
SHA-256: 83218ea17ace4ac1c81ad6bb6c121fdda7f54585de27cbee0dd92df04a1a0ab6
font_01_sfnt_off000110f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F2 15780 bytes
SHA-256: fe0acd27b08d4bdfa13c22dbf8d81d76f170ffe3351188457eb1991e198fd595