Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7435f2135366c8d…

MALICIOUS

PDF

80.7 KB Created: 2021-04-19 20:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: adc503a0f90a7818466e98230f0f9749 SHA-1: 54799126839348bafe374f909c77651ecef67a8b SHA-256: b7435f2135366c8df83eb6ab3b601ae6e28f3c906e3292234647f9126e1a4b25
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://fokemale.ru/strik?utm_term=black%2527s+law+dictionary+online+free+9th+edition', is likely intended to redirect users to malicious content. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as phishing and a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/strik?utm_term=black%2527s+law+dictionary+online+free+9th+edition PDF link annotation
    • http://pusosokus.iblogger.org/75896395305.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5ffc7e642edce.pdfIn PDF document text
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/db03feea.pdfIn PDF document text
    • https://sirowatogiwu.weebly.com/uploads/1/3/2/8/132814809/redejuzibamitiro.pdfIn PDF document text
    • http://gosufogirepejam.22web.org/63111128286.pdfIn PDF document text
    • https://pedidifapa.weebly.com/uploads/1/3/0/8/130874671/xipozetizi-fibijepuge-mazim.pdfIn PDF document text
    • https://lelorovosa.weebly.com/uploads/1/3/1/0/131071021/fiwov-porenikoreketuw-pudezediziba.pdfIn PDF document text
    • https://gezedasi.weebly.com/uploads/1/3/1/3/131378850/xipinodi.pdfIn PDF document text
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/samipinibe_doxorofax_mokilejopegu_siluze.pdfIn PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/4714355.pdfIn PDF document text
    • http://nimened.66ghz.com/knit_garments_costing_format_excel.pdfIn PDF document text
    • https://jewutejaj.weebly.com/uploads/1/3/1/0/131070173/safozunodaxev_pazuv_wutapis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_60611a9de5237.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/ziderenovezodogam.pdfIn PDF document text
    • http://zabopibisoxe.22web.org/50830118586.pdfIn PDF document text
    • https://xegiwisupanax.weebly.com/uploads/1/3/4/3/134367095/7842b3f2af8f30b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buxidogekalor.rf.gd/2016_cadillac_srx_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/588b6c2c-c2ad-40f6-81b1-078d5010a957/nimekowusonifuzuralo.pdfIn PDF document text
    • http://rutefepojurew.epizy.com/psychology_experiment.pdfIn PDF document text
    • http://mokineso.epizy.com/metolupunevuromapomenewep.pdfIn PDF document text
    • http://teramadobowakin.epizy.com/waec_syllabus_for_jhs_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5197db-3fcd-42ca-93a0-78a4be9c47b4/are_braun_thermometers_accurate.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_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 5604 bytes
SHA-256: 2344edc76aa44c4b2a6bc5ecd1be85152da44fcba61ea2163c98c0bed7c7937f
font_01_sfnt_off00011103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 10656 bytes
SHA-256: f3f054420f68c636516a3f9022696d009dd601d56f04717110b0126d2e109118