Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d766d2c44db3bb…

MALICIOUS

PDF

77.3 KB Created: 2021-03-09 06:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: aa9bf3a4928ff33a1b346be878c6ae39 SHA-1: cf025bb1b35175b8a56a9b7e7ce09ef9a59c2fe6 SHA-256: f4d766d2c44db3bb8ad595cf010b14f69759ab6a868deb3dbe5020650446bea3
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 link farm, suggesting a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=singer+4411+vs+4423+price PDF link annotation
    • https://cdn.sqhk.co/nuzitomizaj/b1A8bgj/zara_black_friday_2020_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/gdJhehe/ultra_beasts_catch_rate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368492/normal_6009a4509b5e5.pdfIn PDF document text
    • https://powufaru.weebly.com/uploads/1/3/5/3/135310655/5281385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481403/normal_602251b4a13e2.pdfIn PDF document text
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/6423920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_601e860e99308.pdfIn PDF document text
    • https://posijakafit.weebly.com/uploads/1/3/5/3/135320461/bavoruraveki.pdfIn PDF document text
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/jusotajadosinisasage.pdfIn PDF document text
    • https://pekizexigobuton.weebly.com/uploads/1/3/0/8/130815014/7067148a00cdc3.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/iiSheNz/xenibubaloxo.pdfIn PDF document text
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/ritotuxamabegip_nafapuvurizote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471484/normal_5ffa22d677939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482405/normal_5fe08dbdaa97a.pdfIn PDF document text
    • https://pakefipeve.weebly.com/uploads/1/3/4/0/134017053/a7ff8f.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/vibuvomomuv/how_to_decode_gibson_serial_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/22253243995.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/moxun.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/70651469881.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/how_to_setup_your_roku_stick.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/35403967012.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_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 5460 bytes
SHA-256: a324f3221dd746234476afc29d867cbfde1c0c81d0f6213d25bccf51b672a94f
font_01_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 11424 bytes
SHA-256: fbe38371bb75d2f7e07270c79d12ffc7c5112fb2f0d7693cb77b3c506d572135

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