Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51b0f8915bb582a…

MALICIOUS

PDF

64.4 KB Created: 2020-11-21 08:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4cfebbf827648661b7690a902d73cf06 SHA-1: d9e223dd17d9ec64c6ba3ce8e42a70bda5c14a5a SHA-256: a51b0f8915bb582ac3a807737c7840006f58dd900e86bddcd0e3cc25a71d5e89
156 Risk Score

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://trafftec.ru/123?utm_term=head+soccer+champions+league PDF link annotation
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/zutaforoz-baradidakepilos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490272/normal_5fad4bb709e99.pdfIn PDF document text
    • https://duxuborokepab.weebly.com/uploads/1/3/4/4/134449965/4389462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5fb7f698281c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448549/normal_5fb77cb8631ba.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/9905956.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/d5e156ed-9a2a-4ce4-8552-ae68ba26097a/migasuvonot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419ece54-4dba-421a-b345-c1b9e7ff96b6/18293232339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb3640a-9712-4a5d-a3a4-a93211c3e174/digilopalopuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d928e5fd-f1b9-410b-a837-174f83a3ba14/44970999352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8254d2b-df5d-444a-8caf-41beb7480714/download_dont_be_a_menace_to_south.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_off0000bcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC9 5448 bytes
SHA-256: ad4e02706a5d367f980322bb188d2f47e9d65d8e14cafacc7d963f486b4b284a
font_01_sfnt_off0000cf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF27 11132 bytes
SHA-256: 9a398c0d1d83c20c4ac30435db26d3ad1fe72db0a686cd2332edad7804d17f48