Malicious PDF — malware analysis report

Static analysis result for SHA-256 999d067fa6676058…

MALICIOUS

PDF

77.8 KB Created: 2020-11-13 11:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6613643db855b54ba7b2e83005335d31 SHA-1: c33c319a7eef9c171d437d5f0262b88918392b20 SHA-256: 999d067fa66760587026513770eabdfdb373668ecb51468eb797d53c516245a2
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/123?utm_term=edhelper.com+answer+keys+social+studies In PDF document text
    • https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/felozelalu.pdfIn PDF document text
    • https://misikeni.weebly.com/uploads/1/3/4/3/134336029/700927e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_5f94ef669ac4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408721/normal_5f94ff1fa5bc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f87189d6bddc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5f8ffafd87924.pdfIn PDF document text
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/sipinonigepaxiguxofo.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/0332cc312a195b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_5f96c4af6aed3.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/c746ea1a-f422-4d91-aebd-d1373a620cfe/15082587064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e0ce65-31ba-42dd-bee8-df1827db2406/40037603957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f731d26-4fbb-4d2f-bb0d-12c4dcc11643/best_minigun_fallout_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae1f2eb-6e5e-4594-87d4-3b728aa49163/lanutunijafomojexevojeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9685f588-d781-4ff1-a0b1-8cc2c8b63e98/87423018391.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_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 5560 bytes
SHA-256: 914572e3077c6f2b4c7eb5ef0b7fee3216de02009752560b660e44f7b6665c5a
font_01_sfnt_off000104b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 11068 bytes
SHA-256: 5a3ec9aef981910e695cf47b99b9596b04ce4ebbc3d866d20cdbbcf3fa33077e

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