Malicious PDF — malware analysis report

Static analysis result for SHA-256 6734dbe7ce08784b…

MALICIOUS

PDF

73.0 KB Created: 2020-12-31 08:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6e912074407b6655c193191bad44c397 SHA-1: 8759da428e7514e7c8c22a25dbaf3fe469460db0 SHA-256: 6734dbe7ce08784b74927733f23f1b1346ebb1755db9b43d8612ac68c967ff1a
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to potentially malicious websites. ClamAV detected the file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The embedded URLs, such as 'https://traffking.ru/strik?utm_term=yellow+apples+benefits' and multiple links hosted on 'cdn.sqhk.co', are likely part of this malicious infrastructure.

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://traffking.ru/strik?utm_term=yellow+apples+benefits PDF link annotation
    • https://cdn.sqhk.co/marixefe/X0xhakL/ball_brawl_3d_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/icgj0ib/wimelenanaf.pdfIn PDF document text
    • https://cdn.sqhk.co/wememiguw/dNCiejd/kaxeverowo.pdfIn PDF document text
    • https://goreduve.weebly.com/uploads/1/3/2/7/132740848/2518596.pdfIn PDF document text
    • https://cdn.sqhk.co/butaliwe/9hg6Djh/51530210186.pdfIn PDF document text
    • https://vefapabawi.weebly.com/uploads/1/3/0/7/130740427/janadusujevaxup.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/deb7679d-8334-421d-8d98-e01e960aba91/falcon_4.0_bms_4.33.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5682cc44-4d05-4da7-8c39-48756af34c38/57079301720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b583c4-9517-44aa-9287-f5aef3271a90/28263828393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825a153e-725b-4048-9809-dd9eac89e954/alarak_hots_build_guide.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_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 4992 bytes
SHA-256: 7ec4de95314ecf43a90ef196bc2663f77354855ce2ec0e1d0b3808ca2df8d0dd
font_01_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 11120 bytes
SHA-256: 477a85d8917210b8d2611dbbd92e0b2ba7f8385fcf48617c7f370db27478879e