Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0acbe00a0c71467…

MALICIOUS

PDF

69.0 KB Created: 2021-02-14 03:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e8c3b788dae6e963431803625fc2aa6d SHA-1: 5609a6938c78cbf61f5e2b3d80e6812e1484d0b0 SHA-256: d0acbe00a0c71467edc7adcbd4bf093b3f1d8d93bee9adee58969f3d75047ee3
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm and a callback phishing lure suggests the document is designed to redirect users to malicious websites or engage them in fraudulent phone calls. The embedded URLs, such as https://maypoin.ru/wix?keyword=frugal+bookworm+tulsa, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://maypoin.ru/wix?keyword=frugal+bookworm+tulsa PDF link annotation
    • https://zadivodewereb.weebly.com/uploads/1/3/2/6/132683121/sumujoxo-turulamususixus-vudukidatowopit-palozo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5fefee912a62e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5ff0bb46655e8.pdfIn PDF document text
    • https://zovakilezogavi.weebly.com/uploads/1/3/1/1/131163957/niwekopekodo.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/jgqhcgT/22899059660.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446015/normal_5ffdbd8e22e3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489241/normal_5ffa1a4d56ad6.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/nefomojuwet/97915528170.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/64370718814.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/43954796169.pdfIn PDF document text
    • http://lozepis.epizy.com/4084909639.pdfIn PDF document text
    • http://vorawaforase.epizy.com/nobaxatubuwefikogunij.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_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 5256 bytes
SHA-256: 9217595950dc72977eb1d8a1330a0601b252c11edbb4e86dbd7c0dd928ee73fd
font_01_sfnt_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 10720 bytes
SHA-256: 7eff194d9af87da4fa3c73221038c07d42936b7fdba2aa1e058f2fd706f18cdc

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