Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0128da0ae0e3b7e…

MALICIOUS

PDF

66.0 KB Created: 2020-12-30 13:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6e3918d7c554ef6134a70cda8661e7f4 SHA-1: f6c5d1c5bed1fb6788656ca8b17df3816b2e39ca SHA-256: c0128da0ae0e3b7e40fb39015a024fa3085e9b0f6dafed8816858756ccc67982
184 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 are hosted on suspicious domains, indicating a link farm or phishing attempt. The presence of a 'download button' lure and a callback lure further supports a malicious intent. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a dropper or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/strik?utm_term=green+papaya+hyde+park+cincinnati PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464995/normal_5fa81fc7179ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390681/normal_5f9a45b406027.pdfIn PDF document text
    • https://lokowukaf.weebly.com/uploads/1/3/4/3/134315315/wubofavovepa-boxuw-wuwevavobewo-tiloxufebalatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454046/normal_5fda8899684da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f9046fecf89d.pdfIn PDF document text
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/vunewiwazo.pdfIn PDF document text
    • https://wadexusi.weebly.com/uploads/1/3/4/4/134440973/c4ae7a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461485/normal_5fec4c0baa155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_5f8cb37223883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5fea1983a45ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5fec35214edca.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/libeganot/magnetic_sheet_metal_bender.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_off0000c695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC695 5148 bytes
SHA-256: f615b885eff5740eaf9b0f14ae36674f7d47d13b79851873551c87f12f3e1dd2
font_01_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 10288 bytes
SHA-256: 7dead3cd18599467034c268961f2742b8c780896cadf72500a3848af5cf54428

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