Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b43ca4a8a0845b…

MALICIOUS

PDF

91.6 KB Created: 2021-04-01 11:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f4d7ec711dac3e258371d7d9a7eb178f SHA-1: 90b77a4fb072fca603e80766fcdd768226dd6a45 SHA-256: b7b43ca4a8a0845b5c72b1a8ca1d9568b53a344a8795029514c99c73df6c2e05
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/award?keyword=fundamentos+psicologicos+del+comportamiento+humano+pdf PDF link annotation
    • http://emirofficialzm.com/tarulojifeul2w5.pdfIn PDF document text
    • http://yewes.fun/cuantas_clases_de_adjetivos_hayr9n6a.pdfIn PDF document text
    • http://optalpha.com/99395382229mpe53.pdfIn PDF document text
    • http://mazanatur.space/kinekepowedejebe20ypt.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/jojogamajaketemejob.pdfIn PDF document text
    • https://mirovufi.weebly.com/uploads/1/3/5/9/135958785/xigusirajog.pdfIn PDF document text
    • https://bewimesev.weebly.com/uploads/1/3/4/7/134753962/5aaa35126b.pdfIn PDF document text
    • https://xanuvomapimiv.weebly.com/uploads/1/3/4/3/134342034/a2fe6f87c.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/60883250068.pdfIn PDF document text
    • https://gawugabel.weebly.com/uploads/1/3/4/3/134361726/2681529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://burenevutojalud.epizy.com/tuxuwulawufurimop.pdfIn PDF document text
    • http://milizirasidemib.epizy.com/genero_epico_narrativo.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/vasifunexesonukibitufad.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/98257672883.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/does_moto_e5_plus_have_wifi_calling.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/how_do_u_know_when_beetroot_is_ready_to_harvest.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/how_big_of_a_turkey_will_fit_in_an_electric_roaster.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/44218507410.pdfIn PDF document text
    • http://wixuwozovezo.rf.gd/maths_worksheets_year_4.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/online_calendar_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/21310195812.pdfIn PDF document text
    • http://duziroro.myartsonline.com/is_456_amendment_2020.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_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 5524 bytes
SHA-256: 3112f94ba016be97c4c1ead1377ecb24a9010d44de3a6a4564b4278ca356926c
font_01_sfnt_off00013909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 11752 bytes
SHA-256: 5ebc78ba6ddb040899776b260081bc472c4157b9bdd591e9908b6b2f063e97b8

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