Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1238020ff4359d8…

MALICIOUS

PDF

79.8 KB Created: 2021-05-24 06:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e49af721c1526db1682217937526cb7b SHA-1: 5e97519353854ddce9834356c2403d85f92670bc SHA-256: a1238020ff4359d8e9d281a08bd3f4e5293b4ce8c502b9f8d0127a097bac41cc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDFs hosted on various cloud storage and website builder platforms, suggesting a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. The primary malicious URL identified is https://ponafet.ru/strik, which is likely used to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://ponafet.ru/strik?utm_term=libros+de+ginecologia+y+obstetricia+gratis+pdf PDF link annotation
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/makiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464720/normal_603ba643a696c.pdfIn PDF document text
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/a88a72ad932e83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449630/normal_5fd36981cf65d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443578/normal_6026a36543ed5.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/kiverurumigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_60570e79e3634.pdfIn PDF document text
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/tidijevifex-titotuzenenul-dupapelevat.pdfIn PDF document text
    • https://zolotamazuragif.weebly.com/uploads/1/3/2/7/132712333/durimutawu_famifuxiful_wuzimaza_dopurijuro.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/fd9c3b6db8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401976/normal_5fce937766828.pdfIn PDF document text
    • https://xalakadumikimam.weebly.com/uploads/1/3/1/4/131437423/6776867.pdfIn PDF document text
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/b59cd784ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fixararololu/30913442623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101d5843-0c94-4cae-90fb-db2d674d3a3b/jujoxizixot.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/can_you_use_your_own_fonts_on_wix.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/20190464249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e81f6ad-4c75-4f50-bfcc-005f47b5d622/firex_hardwire_smoke_detector_with_9-volt_battery_backup_and_safety_light.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/wefafavuxasobusolokigewof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bbb0d3d-727c-42ff-a272-88c792e85aff/minuko.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/kenmore_25132_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5822ebbc-a30c-46f1-80ed-8960d43b04d5/sample_good_food_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b0cecd5-4a4c-4f18-881f-bfd1a1f09dae/29501263508.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/titisuvoterekekufelamujim.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_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 5504 bytes
SHA-256: 2155a143894da60abe6e27c0f2c2c08eb81ad7e83a7db512bec1cf0491d8b51a
font_01_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 12356 bytes
SHA-256: abcf9a3d3a27f9b1bb6f5e70fdc1ee6df0281d9e1ef9b0c46780154084526800

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