Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a9dcbd3e6fd443…

MALICIOUS

PDF

41.0 KB Created: 2020-04-06 06:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: 0a0939a8a65d1ed16ed149d575dd12a1 SHA-1: 8bd618a2c922d732c9f0956282e977612ce71cff SHA-256: 23a9dcbd3e6fd443f423d3e63a6831b2296e6ab5b4c1a7910b0f244e76d66e0b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm of numerous external URLs, many of which point to PDF files with numeric slugs. This technique is often used to obscure malicious intent and distribute further malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 http://wolfecityhomecoming.com/uploads/1/3/0/5/130589315/130589315.html#national+pressure+cooker+no+7+replacement+parts PDF link annotation
    • http://timings.ca/uploads/1/3/1/3/131384489/91a47a.pdfIn PDF document text
    • http://jacevedo.nyc/uploads/1/3/0/7/130740537/bf065272e23d567.pdfIn PDF document text
    • http://scope-for-growth.com/uploads/1/3/1/1/131164366/lomomafed.pdfIn PDF document text
    • http://tandaexperience.com/uploads/1/3/0/5/130546457/pajaloso.pdfIn PDF document text
    • http://veronicacastroweddingplanner.com/uploads/1/3/1/4/131406804/4935723.pdfIn PDF document text
    • http://psiconutricion.net/uploads/1/3/0/7/130740258/denodowo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A5 8504 bytes
SHA-256: abb44e46a7452fd39c9eb9c5f38c3b99fc463c4835fcc73628f66a1bcdae41ce
font_01_sfnt_off00008151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8151 16204 bytes
SHA-256: f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d

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