Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b2f4edb16af439…

MALICIOUS

PDF

60.0 KB Created: 2020-10-12 16:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 82911f76d1ecd00178fe998802d1386a SHA-1: 69ba4d71b37576d1aa25598ddcc0f90901af323c SHA-256: e5b2f4edb16af43979756fc1824662349829c7192c457316cb3c9cc30028ce4b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable hosting and redirect to malicious infrastructure, such as the URL https://ggtraff.ru/strik?keyword=maritime+insurance+law+pdf. The document body, though heavily obfuscated, contains text related to 'maritime insurance law' and the wkhtmltopdf application, suggesting a lure to disguise the malicious link farm. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/strik?keyword=maritime+insurance+law+pdf In PDF document text
    • http://najolebev.icomppower.com/uploads/1/3/0/9/130969077/45433311ed.pdfIn PDF document text
    • http://files.glimmericks.com/uploads/1/3/0/7/130738765/fumatisagir.pdfIn PDF document text
    • http://livib.jessicawindhorst.com/uploads/1/3/2/6/132682905/8241218.pdfIn PDF document text
    • http://files.ridgeforensics.com/uploads/1/3/1/4/131438541/joxuxeba_wufogovixupibed_jaxefak.pdfIn PDF document text
    • https://site-1038951.mozfiles.com/files/1038951/pipixogevofefoviwuvamakax.pdfIn PDF document text
    • https://site-1039503.mozfiles.com/files/1039503/momow.pdfIn PDF document text
    • https://site-1042540.mozfiles.com/files/1042540/gagalulidufatikabuzobufob.pdfIn PDF document text
    • http://files.basscoastpost.com/uploads/1/3/1/3/131378942/ef49d7008711.pdfIn PDF document text
    • http://sukivomim.skyridgechoirs.com/uploads/1/3/1/3/131383599/vamarajebulokika.pdfIn PDF document text
    • http://zebixuwod.mihlsa.com/uploads/1/3/0/7/130739663/cefb0501a19.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/872c3b49-6d63-4572-8f8e-9b16d40104d5/62490449129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/607ca40d-4479-4e38-a756-cc3d07efd674/68095815538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1f0bbe-741c-45ab-9fd1-838f6924293f/xedejipulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4999eae6-aaff-449f-b519-62a808afb3a9/24100787891.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_off0000abf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABF2 5400 bytes
SHA-256: 7bb5ac8a122a58c8a5a50c071e1c3444a08f449ce6a5f46095f16e4cf7f349c4
font_01_sfnt_off0000be4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4C 10800 bytes
SHA-256: 1651602cb504ca2b7d253a8b62dbf41c47564807f8bfa1efcfa585bd4befdc37

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