Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c38a5e907de3d7…

MALICIOUS

PDF

73.9 KB Created: 2021-05-27 02:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f06cc6c488ff4cc496d5f49fd0f77cf6 SHA-1: 846ef9672081a5948c3198ce8850fdb5a25ae429 SHA-256: b4c38a5e907de3d7152e6d8cf9a45c95f6fe4690be908e0867626b5eddc227c3
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 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=convertir+pulgadas+a+mm+online PDF link annotation
    • https://matisosu.weebly.com/uploads/1/3/2/6/132681513/92d3bc188b.pdfIn PDF document text
    • https://vanewuzopawibo.weebly.com/uploads/1/3/0/8/130814706/af75f719ab44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415756/normal_5fef43fb32677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_605b1d5866c8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_602e9d331a8cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_600a1ae26cacd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484805/normal_5fc5c8d607686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5fe99e3059a7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482638/normal_5ffe5340cbdd7.pdfIn PDF document text
    • https://jaduvobawitirok.weebly.com/uploads/1/3/4/3/134398576/xodikekageno-natolozojozu-padot-pifuwakipenev.pdfIn PDF document text
    • https://zunatiwol.weebly.com/uploads/1/3/0/8/130815351/fekilexep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3521f4a1-acca-42b1-855b-2d4fc0d80271/fojepafesun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e2bb13-31ba-4668-bb91-61b12b3c92e4/panasonic_inverter_microwave_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45b490b2-7f85-401e-bc20-b6abbdd6930d/jazoposulifaloni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be02dfd-0a5c-4ce9-8af0-2cd97e37fded/simple_comfort_2201_thermostat_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40018be6-2515-4b53-80d5-9a025374e44f/28947784428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35e78a6-7197-4161-8012-b2f248dfef4f/floureon_energy_meter_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf68d684-a25f-4d6c-bb9a-6caba6c6e0d5/41680441137.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_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 5244 bytes
SHA-256: 30025b97f3d0b63d3ad33d47448d1e38dc05ff1b09f29f1f9d54c99ce53e5b41
font_01_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 11960 bytes
SHA-256: 1a1208ec05b68ccc8db16550e433459fcb866b412fc45a367352fdcdbcec9d57

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