Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e16ecb3c1c200e…

MALICIOUS

PDF

74.9 KB Created: 2021-02-24 20:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8c6c93a742cf2c47d3d39552aec9b0f9 SHA-1: 9838f5e2776c57323e88cb7a0a78a8b4db7db43e SHA-256: c4e16ecb3c1c200e162427d6b22c61f74938b7da99242b89d81a013662596684
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it functions as a link farm or a phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, pointing towards an attempt to redirect users to potentially harmful websites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wb?keyword=sony%20sa-cs9%20setup PDF link annotation
    • https://cdn.sqhk.co/dadakafopina/GqXibig/kuxujofamadezib.pdfIn PDF document text
    • https://cdn.sqhk.co/pobusafi/rphbicR/39718719363.pdfIn PDF document text
    • https://kexowepapu.weebly.com/uploads/1/3/2/8/132815076/8710211.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/jaIQRih/5505383213.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/jcYkifG/80438346023.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/yShahdO/cooking_joy_2_download.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/free_online_digital_marketing_courses_with_certificates_by_microsoft.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/dbBsihK/15681782429.pdfIn PDF document text
    • https://cdn.sqhk.co/nikazurokuv/jjChegj/blockchain_wallet_address_keeps_changing.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/sKigicG/percentage_change_calculator_soup.pdfIn PDF document text
    • http://mkuu.club/nutone_central_vacuum_utility_inletjtntx.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/zasepo/pusasalobebujulef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 5024 bytes
SHA-256: f30421d8d584440bafb51f7d8c725b200c1d3cb6bec9a278d3e6c4ec96621465
font_01_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 11096 bytes
SHA-256: 5826c6a428e6c5979e953525b0de3557965a8613808507f1a0f7ce83545f3073
font_02_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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