Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89bed2323179cb5…

MALICIOUS

PDF

74.1 KB Created: 2020-11-09 22:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d8dfc64274020d0b0abd6235719c4918 SHA-1: ddd00b9f63c5707a0434924764165e071cc6f90e SHA-256: c89bed2323179cb545df00cdbef6dc3821489ec7bb8dcfeef21d35c017bd4d74
164 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 presents a deceptive download button. 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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/aws?keyword=avg+vpn+product+key PDF link annotation
    • https://bajumavo.weebly.com/uploads/1/3/4/4/134486103/1593647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462980/normal_5fa339606d3dd.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/8838600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_5f9254f63e2cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wonoti/95957544531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c32f796-1a19-496f-aafb-432eac4f0a33/77185510327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a49bd1-b11e-47b1-b20b-789804a398eb/physics_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/1672668472.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/13005164138.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/ayyappa_bhajana_patalu_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/milwaukee_impact_wrench_2767-20_ebay.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/how_to_solder_brass_radiator.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/lev_vygotsky_scaffolding_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/acrylic_color_mixing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c96204-805b-4249-8bbf-ee106d80e815/timakabidaboravejaniv.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_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 5036 bytes
SHA-256: db759240da85d8b6bcedd5f30db833ddbb32601a8461eeef8ba7b20bc9d4ee9a
font_01_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 10612 bytes
SHA-256: b478efc562021d34824002519ec9c94efe95be8e1ff8ff8672b64de6e2ba2c91

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