Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9244d85514d95fb…

MALICIOUS

PDF

82.4 KB Created: 2021-04-05 00:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 96844b5081d982c6fce12c5e700c3f16 SHA-1: 03cabad4a4ec328eabb8b382896c72c596d51b53 SHA-256: b9244d85514d95fbcac50671b723632a0a109d5938c7624a0003f7c6937a31c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, identified as a link farm, pointing to various PDF documents. One of these links, https://jacksth.ru/wix?keyword=magna+extra+plus, is flagged as suspicious and likely leads to a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

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/wix?keyword=magna+extra+plus PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366627/normal_6007bc51b7187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_6048c3df22fb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448129/normal_5feefe7bdfbaa.pdfIn PDF document text
    • https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/moguxugejixovogoguj.pdfIn PDF document text
    • https://piwobovolan.weebly.com/uploads/1/3/5/3/135388479/4cc458ab0a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_6012620a64286.pdfIn PDF document text
    • https://pareruli.weebly.com/uploads/1/3/4/8/134891857/4697142.pdfIn PDF document text
    • http://dusogewosat.iblogger.org/8277920559.pdfIn PDF document text
    • https://zefisazivite.weebly.com/uploads/1/3/5/3/135314851/bavukikikepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/makixibawumebol/carrie_fisher_wishful_drinking_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/70041347788.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/alcatel_lucent_i-211m-l.pdfIn PDF document text
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_93919dd62a3948739742b06f54568916.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/fotivajurovesewewemamox.pdfIn PDF document text
    • https://9ffa65b4-b95e-481c-977d-2cf6acaa57d7.filesusr.com/ugd/f68d46_97b87164c42d478fb61c707e55c29589.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c2d5ad8-06b6-4c04-982e-eeb63bbca370/hp_officejet_pro_8610_printer_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e107e9-8755-4b25-b336-34f23f16d577/solution_manual_fundamentals_of_momentum_heat_and_mass_transfer_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/tratamiento_de_caries_en_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1646b4-c4c2-4160-b158-d887b6df8ea5/crossed_by_ally_condie_summary.pdfIn PDF document text
    • http://winovonisalupib.rf.gd/agrometeorologia_libro.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 4784 bytes
SHA-256: bd36db67573071473aa0fe3f30bf470553c72699316d4b965d04301a2009cd14
font_01_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 2640 bytes
SHA-256: 22a26552828c70d3670ce3ce52cd694304336acfefc564044809931e542af106
font_02_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 10688 bytes
SHA-256: fa5e5fec61215761856050ead9528ed62bb7436ad596795c4fadb6dc0d759654
font_03_sfnt_off00012e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E20 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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