Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d57c871c250a273…

MALICIOUS

PDF

66.2 KB Created: 2020-12-07 23:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d2192fb1242c2cffc8dc5fe187d52a07 SHA-1: 9d6e0419914e8546b6594186303835619151e5e7 SHA-256: 3d57c871c250a2736605d89be50c9f89e1c0b9b28e45cbe024f9c22debd1bb3b
156 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. 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
  • 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.
  • 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://trafffi.ru/strik?utm_term=delonghi+portable+air+conditioner+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394082/normal_5f90937069095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_5fa6a1ce51c35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f88cbbdce177.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8980310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_5fa0198233c16.pdfIn PDF document text
    • https://dexetejitifite.weebly.com/uploads/1/3/4/5/134576896/josojoxaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_5fa9125820abc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5fa1492d5ef92.pdfIn PDF document text
    • https://malebikixolu.weebly.com/uploads/1/3/4/3/134358595/voxefu.pdfIn PDF document text
    • https://moxitimufetumo.weebly.com/uploads/1/3/4/0/134040580/1941745.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc12052bd14ff0dd29e0ecd/t/5fc52d5f3c6ccf69f305e7c6/1606757727682/58024609162.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd12d394c5aa73c8ed2234/1606226646379/blood_pressure_virtual_lab_glencoe.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/genre_and_subgenre_worksheet_6.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_off0000c743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC743 5448 bytes
SHA-256: 030e7b91b970036fa1af4fc2bf40c7fdf72c7da3d104ccd5efa3cdd9679ecb5d
font_01_sfnt_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 10064 bytes
SHA-256: 9dcfadca7d76efdffb77632fa1a4b5935896bceb48243def66eba5b289931d27

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