Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70d94ffc9d2daec…

MALICIOUS

PDF

75.0 KB Created: 2021-05-26 20:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 633a18f8a6655e7b26fb4715e47698a0 SHA-1: 45423dfadced6cb12740317a1ee8eb3c3f0087b9 SHA-256: b70d94ffc9d2daec962e6fb8e70ccde1331e4db02304b5d45aa4bf2d93782c99
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to redirect users to potentially malicious websites. The document body, though heavily obfuscated, appears to be a lure related to 'dna structure worksheet answer key quizlet', aiming to trick users into clicking the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=dna+structure+worksheet+answer+key+quizlet PDF link annotation
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/04f0203de59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_6057a94fd25b1.pdfIn PDF document text
    • https://maposege.weebly.com/uploads/1/3/1/3/131378999/nowetoxasilugese.pdfIn PDF document text
    • https://xixafaxuxux.weebly.com/uploads/1/3/4/3/134340403/e945aa99d.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/0286e432.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5ffa93ec41415.pdfIn PDF document text
    • https://nadazeva.weebly.com/uploads/1/3/4/4/134499610/valafuje.pdfIn PDF document text
    • https://xugibadibexupov.weebly.com/uploads/1/3/4/6/134684970/7661936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490380/normal_5ff10d5ae552b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483103/normal_6000f0af5d456.pdfIn PDF document text
    • https://fitadidexedas.weebly.com/uploads/1/3/5/9/135977916/bekeseputixoje.pdfIn PDF document text
    • https://pajuxosam.weebly.com/uploads/1/3/0/9/130968950/nujola.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/3564422.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_60039b59332d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5fe4da346e234.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371025/normal_5fe04c4e2b71a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_60129811c4584.pdfIn PDF document text
    • https://buvokatawun.weebly.com/uploads/1/3/1/3/131378806/9219137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_601cfc4cd440f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 5320 bytes
SHA-256: 03fa5ed093642f0b8b50b79bc3be1b27d9e2257db9610c0cfc84395a25fa7d7a
font_01_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 10280 bytes
SHA-256: 8aca7048f25dc7d215f69c9e2e0a793659d39a1edf50fbaeb41039c805c21fe6

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