Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aaf4b6342b0fdf3…

MALICIOUS

PDF

66.7 KB Created: 2020-11-19 23:50:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ba62bd5ee4196ce5ade8b35037765cb6 SHA-1: 909ff00050c6b16723baa85fec4034db02b2a081 SHA-256: 4aaf4b6342b0fdf3fd01b36728c71e7b0206b1103d74a769f950cd09a883266d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=burdel+las+poncianas+de+chiclayo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_5f9e4eb77f765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5f8f16c49b55c.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/711678.pdfIn PDF document text
    • https://peniwomafases.weebly.com/uploads/1/3/4/7/134705361/148728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f91cd8aac1de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5f9c117c2b33b.pdfIn PDF document text
    • https://gutomaxitokivi.weebly.com/uploads/1/3/1/3/131383747/3677785.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/peduzuxiwekexozegoge.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/nefewubomozimizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5f9da34c68b26.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/4a4477b6-633d-48d5-802d-01ed252eb012/amorous_dustin_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f957ac1-e895-4493-9bd6-759c1347035c/funeral_program_wording.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8edf5d7c-4e6e-4341-941c-56eb0d06401a/princess_nokia_1992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af1bcc7-a002-426c-9c47-a4b55e12d738/danmachi_volume_13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75af52c1-3487-473e-8977-32b060a96ca5/26542455394.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_off0000bc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC69 5312 bytes
SHA-256: 2615da112a1c58961958991a6cd314a490dffaf0c484978ff34245e4fe84287b
font_01_sfnt_off0000ce70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE70 2160 bytes
SHA-256: 8365a2e9a286075fc42af75fa67921f75f6c827e888dc88a7f3899cd18c9364b
font_02_sfnt_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 11812 bytes
SHA-256: 33785a8f100c9d0ed51fc2a69cfecc93f729e9b912c42ee656ce2b6cd1cff703

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