Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb680b9baab71db…

MALICIOUS

PDF

81.8 KB Created: 2020-12-28 08:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7862c47495f4a180352a4b97580405b4 SHA-1: 73977c1c06264f42689fd5465eb11f4cd271dc0e SHA-256: cdb680b9baab71db388778d3e53412e023a231d5fa19fad4c0c6c067f9cb90a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO poisoning tactic. The presence of a 'download' button lure and ClamAV detection as Pdf.Phishing.Trojan indicates a malicious intent, likely to direct users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's designed to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/strik?utm_term=bio+inc+redemption+free+play PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407749/normal_5fcc559aea604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_5fd7283aa3cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5f967b623011e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477376/normal_5fc64c413d233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386849/normal_5fe368c8b01b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f9a5ab205476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fd1002467b67.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/6233550.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/9377619.pdfIn PDF document text
    • http://www.opentle.orgIn 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://uploads.strikinglycdn.com/files/b6e355ba-b34e-4b08-815e-a2b7885ea52f/42833668032.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/25154633351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf83f3d-eb7d-4ae9-a258-fe98d7aa543a/warframe_lephantis_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a907b0-be5c-455f-8a40-7f7678018a87/19888273377.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/tabernacle_of_david_kjv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd6a69d4-e74d-4872-9279-5e106eaaad33/66953905023.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e57d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE57D 12312 bytes
SHA-256: 857287560f06c35eec4b1b04b5d15cbbc0f6e598eb193de7f130885e5cea53cc
font_00_sfnt_off0000d471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD471 5060 bytes
SHA-256: 71b8a132e597923529c57b1abdff8fe406bee9876f80641561323a3b00f10073
font_02_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 10352 bytes
SHA-256: 33943dbb39d39de50bec30e0dc01aa2992036f061f13c516b3b6aeb74cb30dce
font_03_sfnt_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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