Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbf9da27eb0d049…

MALICIOUS

PDF

75.5 KB Created: 2020-11-11 16:22:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ca8cc09cf2786bd050eaebc354e04476 SHA-1: d3b1711968e38004c849cbab36d0811fc9c4c5c3 SHA-256: ccbf9da27eb0d049e11d913451f1e2f50bf7a081723897b04bd65aaeb959711c
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 0.9995

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://gettraff.ru/123?utm_term=zillow+search+homes+for+sale In PDF document text
    • https://niresofitize.weebly.com/uploads/1/3/4/5/134576450/fitux.pdfIn PDF document text
    • https://gagumosesixibo.weebly.com/uploads/1/3/4/0/134018544/7807418.pdfIn PDF document text
    • https://tivulose.weebly.com/uploads/1/3/4/3/134318041/84f1fcf4e08537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5f93c40a17b51.pdfIn PDF document text
    • https://repenakexo.weebly.com/uploads/1/3/4/6/134600143/5afb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451756/normal_5fa9e1b75a003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f91598e562d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426073/normal_5fa07b8909037.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/henghuili-files2/vejegixarisonifapol.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/96406747655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40558485-386c-4a1e-aa53-a3c0ce024a85/49671945678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e375be02-2e7c-44cb-9dfc-09d28c331dce/xizesofokumofilase.pdfIn PDF document text
    • http://www.alexa.com/topsIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC252 4772 bytes
SHA-256: 405f5372f1f5432428c2a3b28b13fe278d1376beffd0c395e0047b4d9fdd0175
font_01_sfnt_off0000d28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 10744 bytes
SHA-256: 3fa1ea3074f90a3a767e66f198a46ea95101bea49a10f1e8ae3aa87fa031b117
font_02_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 17840 bytes
SHA-256: 0fe3b07317ad894db6a28cf7ae3631926f47ebda8827d32dbc227de5a4c616b5
font_03_sfnt_off0001129d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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