Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5340cf5d3504ff…

MALICIOUS

PDF

83.9 KB Created: 2021-04-04 19:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c673a80f1f8a9aa5a0923fdaedb06586 SHA-1: ce9c29badfbabeaddcdadad503abd883d3d2c885 SHA-256: 0c5340cf5d3504fff6fc76585458281a875eaf545e35bda0ac95a893d7be4a52
186 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 0.9993

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://soxebez.ru/award?keyword=something+anything+%25C3%25BCbungen+pdf PDF link annotation
    • http://tegor.xyz/47559331452y3tox.pdfIn PDF document text
    • http://fuckfrsky.com/xarubewegemanibakewijon4bn6.pdfIn PDF document text
    • http://hookup154.site/best_computer_hardware_and_networking_institute_in_delhizpudx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa0e375-d104-425c-9dc7-88475744db58/progress_in_mathematics_grade_3_teachers_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39517895-1766-4777-8666-5854cf8d5baa/big_nate_blasts_off_ending.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_0cd53e9095e84a2284f945d324215b18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetituri/casio_aq-s810w_price_in_philippines.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_79bc6143de31476b8825a64b49d28478.pdf?index=trueIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_ae787c6bdf7946d5914ab592eda4e728.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_20bee602055747e4aa7eb4164df1e7ce.pdf?index=trueIn PDF document text
    • https://5d55c623-01b0-417f-8131-8dfd0334080c.filesusr.com/ugd/9ef046_33421135d011444f95bad5cfcafb4db9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/2614362176.pdfIn PDF document text
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_169d7c20d751405d965ff1eccc6d4d1a.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_2679cfa166f5477bac2a55beb9eb419b.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_5f63f141eb4e46c2b3852170bcc854d6.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_3cb188bc0e39415a9db0e50b73f6b212.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8db4ef7-7190-442c-a7f7-94c5d8123685/values_worksheet_adolescent.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/93752502337.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_b10329da64214b4180393403996dc752.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8fa41b5-7ae4-4c94-a134-4bc7c27450dd/mechanical_engineering_internships_chicago.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_911eeb55b07c4817bd10403b2df8d2c9.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 3036 bytes
SHA-256: efeee12010c59c0d2c0742bffedd9ed82e6d6de0c82a841046fc411362ae50d4
font_01_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 5616 bytes
SHA-256: 5260541bc84fa9eaf60b4ada0eccff942eab8e0e7abbdc6b3a205e8cab6598f6
font_02_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 11736 bytes
SHA-256: 30f260f6ae3346a1d611df2a78a692aab9cc4e87e0cda6628e8f65198e99c6ce
font_03_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 17920 bytes
SHA-256: 38cb139de0dc9fa544fe0446f879e26942149abfab2884e169df72d5af7f5f34