Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b88a713dc9d1ff5…

MALICIOUS

PDF

73.3 KB Created: 2021-02-21 14:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 096dfb864c2b9e7610343c8a02a10a05 SHA-1: 7386bb58a9bc879d75422b95ed90fec64b3faf13 SHA-256: 3b88a713dc9d1ff5682e850f5e4e310ebe839e6ef15058a8ba75a9faebe61d12
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. One of the primary external URIs points to 'https://jottigo.ru/wix?keyword=stickman+badminton+2+y8+games', suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://jottigo.ru/wix?keyword=stickman+badminton+2+y8+games PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488135/normal_5fcf3ebb404c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_5fd60f6e45eab.pdfIn PDF document text
    • https://ripabukufekova.weebly.com/uploads/1/3/0/7/130738984/3648385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403960/normal_600d1822e3696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_6030785dbd622.pdfIn PDF document text
    • https://wixofixun.weebly.com/uploads/1/3/1/3/131379115/beliliwumufob-lumubajexibut-lesotegawanex-libibasujan.pdfIn PDF document text
    • https://mediwamogapani.weebly.com/uploads/1/3/5/3/135318379/1204163.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482216/normal_5ff3b15d73f54.pdfIn PDF document text
    • https://rivatuvimib.weebly.com/uploads/1/3/4/4/134469475/perubibelakos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_5fe9e15f96c95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_6024afa59426c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471256/normal_5fc70fe1256a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485810/normal_5feece1bd39b2.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/wumodukubaru/4051636138.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/temaruwopubojovalowenu.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/driving_home_for_christmas_sheet_music_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/51850365596.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/lenurujamamivuwodotukusok.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/navedukasivab.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B7 5864 bytes
SHA-256: a159957858240779bfe0a31184d1bef80509a81fe1ddfe5a627baf5669be3df7
font_01_sfnt_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 11180 bytes
SHA-256: c2a822ac936686d89cbce0bc95323ec0937b7e2083bf4704596c5d160832d484
font_02_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 17280 bytes
SHA-256: 00e082ba52939948dd61367c5f286376e76304f251adb3d2c07f5cd35ea76599

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