Malicious PDF — malware analysis report

Static analysis result for SHA-256 258a15cda419397a…

MALICIOUS

PDF

76.7 KB Created: 2021-04-29 09:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 54da93eacf3dd5d65db57c4c2ee00eb4 SHA-1: c6951350b5248ffe0130d0c9578921021d65a54c SHA-256: 258a15cda419397a2d8adc22ad0302d63fb82d114f9b1c2f47efaa4e6343a338
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/strik?utm_term=adobe+premiere+pro+plugins+free+download+for+windows+10 PDF link annotation
    • https://cdn.sqhk.co/tazifawixax/hcBNRie/fakeledevupapefudofizu.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/cellule_de_crise.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/6rghm6y/46533895293.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/ggiMijT/elements_of_art_and_principles_of_design_posters.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/voicelive_play_looper.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/akihabara_station_map.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/aYibrjb/94897139132.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/ghasidQ/rofimewulo.pdfIn PDF document text
    • https://cdn.sqhk.co/dozirerom/dRgTLiP/77407600989.pdfIn PDF document text
    • https://cdn.sqhk.co/bitubebo/HFOgcFk/kumitago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_6082b0ec585243a4bad350a470edc862.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusined/audacity_software_cnet.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_8e5ab7bc9c124a10b0f500e46ad292dd.pdf?index=trueIn PDF document text
    • https://7920a853-f458-4dfc-a893-f50c3ed6f780.filesusr.com/ugd/fe7850_173a06c9d5a642aa9f8a878c561d17bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/ganufebubupujunelunokokuw.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/97579362760.pdfIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_5cb1a8ee2aa84729985bba92c3132e14.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_eb54ddc6483c48bba3706131897c1b33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/bmc_full_form_in_dairy.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/bajaj_allianz_general_insurance_renewal_copy.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/27559157583.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/why_does_god_use_symbols_in_the_bible.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_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 5776 bytes
SHA-256: ab7a20b81830abc66dabc0645fe5f27d06feace167d037007dbd9fde6c9caf8f
font_01_sfnt_off000101ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 10220 bytes
SHA-256: 369a876201108cd5ef3c1b274e11dea8db68e8bb65fd39feae562269dfe63f0a

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