Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bd205f1058359a…

MALICIOUS

PDF

67.1 KB Created: 2020-12-07 13:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 41c26eb6b26113cb5f87190e0af9b77e SHA-1: 8f8346168238e395c3f71dcb3a55afaff971f6c4 SHA-256: 31bd205f1058359add4d624fa0075053274a6a1b5e6af79ed370072e1cd6eb85
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document's primary purpose is to host a large number of external links, likely for SEO manipulation or to redirect users to malicious content. The presence of an embedded URL and the overall structure point towards a phishing or redirection attack.

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://traffset.ru/strik?utm_term=subaru+forester+lift+kit+2005 PDF link annotation
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/jimobexonisaxori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422392/normal_5fa8f40238d97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc18b2c68612547ed62b026/t/5fc35ecaf3de5e49b5cf2ac6/1606639307442/atoms_and_periodic_table_unit_crossword_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79dedd743eb43444a3c30/t/5fcaf2f7a0b42e35669e6bfc/1607135994587/ice_cream_sandwich_dessert_with_kahlua.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10f7f085bf90c0efdfe77/t/5fcd0cab978da30c5601d6b7/1607273646448/sedozafi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64ee16b97992eb580530b/t/5fccb3bfcded405bb8d4ec70/1607250880060/popidulobut.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56cb79955c744b559bb78/t/5fcd78fd978da30c56137397/1607301374276/air_soccer_tabletop_game.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12a77be9b6939510c7598/t/5fc2a708fa04221c7176afbe/1606592268126/tableau_developer_resume_points.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f4078787e879896c419e/t/5fca8fe24780a7770579ff54/1607110627507/syrup_and_the_ultimate_sweet_endings.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc556ca5bcb0228a2a007f0/t/5fcbe8b321c0486e91a2fc58/1607198900891/venice_travel_map.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/26409043198.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_off0000c8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D5 5468 bytes
SHA-256: 96fc9f2b8b2d796602726bdba482a96d01916afd77ba8c9f3c6d379db9494782
font_01_sfnt_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 10708 bytes
SHA-256: 9f5a86f40559ca5931d2e78ba8f994e23700e1004f342b60586e3b64192d4f63

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