Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c78cccaaf13c97…

MALICIOUS

PDF

71.6 KB Created: 2020-12-29 19:09:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1ea652ca3cf6e0dbf04af25396114ada SHA-1: e76624c7050f272d5e8e3f51fd7f65b35ed5e41b SHA-256: 11c78cccaaf13c976e5ff371295ae5a4b311f7122e00b7819aa40d5ae957a9b6
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 0.9995

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://trafffe.ru/123?utm_term=jesus+is+the+answer+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453344/normal_5fbb7077ebdcf.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/916016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454541/normal_5faf008667f7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_5fea1d92a296a.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/fifomi/apple_insider_buying_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/xuburitel.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/cpns_belitung_timur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aeaff65-dd58-433f-bf29-92c75eb7558e/wogosuk.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/aarti_kunj_bihari_ki_girdhar_krishna_murari_ki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a0bcfd-3609-4957-b5df-c3f5089a5f3f/faroluves.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_off0000dd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 5088 bytes
SHA-256: 38ba0a5596b0d4d341c9ade7c4d3b6cff3ed057767db6606dae9e57278a60322
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 10448 bytes
SHA-256: 7844346a5c79a0a462e9e4964ddf788bd8e5d6a0a3593a21a086af76de88a214