Malicious PDF — malware analysis report

Static analysis result for SHA-256 6586f7b72201f8dc…

MALICIOUS

PDF

75.3 KB Created: 2021-01-07 08:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3516afa8076776ce9b6fb333a90c8c0e SHA-1: 0e8df0b04bb4657815f24a663b97289faec20548 SHA-256: 6586f7b72201f8dce25e23dae287cfc407e5192e2410c0b0b7ae2041912dac5e
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by a machine learning classifier and ClamAV. It contains an embedded URI pointing to 'trafftec.ru', which is likely part of a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=average+table+height PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481408/normal_5fb4db69a7ffd.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/b5Jr1gg/my_little_princess_china_drama_wikipedia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367964/normal_5fefc5e04247e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450504/normal_5fc56aaec5826.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481069/normal_5fe3ae0e251ee.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/WOOBqdE/77268856245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425515/normal_5fc80da6173f6.pdfIn PDF document text
    • https://cdn.sqhk.co/ledusefugize/ieYUEhd/76861111476.pdfIn PDF document text
    • https://cdn.sqhk.co/sadisadaz/igehc66/gufimidexufomikomuvizol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504839/normal_5fc5cdc074955.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/83a4258a-5e60-4192-886c-a456421268f2/baturabodalokoxefirabenat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c12ff0-586c-4cd8-b317-879014369e3b/reverse_a_string_in_cobol.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_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 4956 bytes
SHA-256: 852a40db19aa1731cff7649f2a1686a85f139d67d0fe4f8b895adfc853a5b1e7
font_01_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 10428 bytes
SHA-256: 391568781eec3159593cc7a49d469441a7b9798f42a89b05a7132bae9e13a6d9