Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe9123a2e408bec…

MALICIOUS

PDF

58.6 KB Created: 2020-11-13 21:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 48ffe8b9c3eebb2b5e2bb3d63b7dddea SHA-1: b74b8fe70061500f8e2c02a54979c70f57c8b29a SHA-256: 2fe9123a2e408bec10d8e471e9ca400f079b81fc4f42b4446849cba24bb6cc6d
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm and impersonates the DHL brand to lure users into clicking a link, likely for credential phishing. The presence of numerous external links suggests an attempt to manipulate search engine rankings or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/linurigaruxox.pdf.
  • 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://traffine.ru/123?utm_term=lesson+4+pre+class+quiz+macroeconomics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446937/normal_5fad7c99ca6b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5f9776b93a7e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f90053b6759e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_5f94b1c7deadc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5f9492cf9883b.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/linurigaruxox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5f8d89a43538b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5f8f22ed5bbb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f962d807a0ca.pdfIn PDF document text
    • https://rarowovi.weebly.com/uploads/1/3/4/6/134664267/6204872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_5fa203486cb75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5fa23941cb373.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000aadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAADB 5284 bytes
SHA-256: 2688135079bab221c2abccc449f52846fb021a4e0c58cd6345a77a55120dbdbd
font_01_sfnt_off0000bcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD9 9652 bytes
SHA-256: 47d7f7f9077b50ee89d2cd7d781928ab9c627f050c80dc8513ef89a4ddcd8caa

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