Malicious PDF — malware analysis report

Static analysis result for SHA-256 be97335c47f8a5fe…

MALICIOUS

PDF

48.4 KB Created: 2020-10-14 03:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d97df1feb6d3298cf4cff67a17d9799f SHA-1: 621eaf06b21d4878e621e84ad0fca35a70007d25 SHA-256: be97335c47f8a5feb8fd8456e89ce73d3c6c822294bc22bab5af3bad98e8d15b
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to external PDF documents hosted on disposable domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links leads to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be distributing a large volume of links, likely for SEO spam or to serve as a distribution point for further malicious content.

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://cctraff.ru/strik?keyword=ambiguous+column+name+sqlite+android In PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/domovodibaposix.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/tunitulo.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bigunurusipota_vovavubavuw_malolipesafa.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/zikarab.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/0c18874847f.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/96704245895.pdfIn PDF document text
    • https://site-1038553.mozfiles.com/files/1038553/86502970595.pdfIn PDF document text
    • https://site-1043475.mozfiles.com/files/1043475/sewuromigafibeluweveluk.pdfIn PDF document text
    • https://site-1043891.mozfiles.com/files/1043891/nitesibivifak.pdfIn PDF document text
    • https://site-1044071.mozfiles.com/files/1044071/poroxalabefijezi.pdfIn PDF document text
    • https://site-1038949.mozfiles.com/files/1038949/51004496919.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/17882533391.pdfIn PDF document text
    • https://site-1039149.mozfiles.com/files/1039149/jotenesu.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/43d8ad9d-09b5-4763-a7c1-50b7efbdf2a6/tapogitupofurel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7975bb43-722b-42eb-a285-60f1c50b7487/fuwamonurav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9495cc-b914-4ff1-ab14-ac707e1e0b83/69965474002.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_off00007a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7C 5516 bytes
SHA-256: 3c034eecc15521edaa4cef5c08ff95e66df20293187cae7eb85366ac73f97132
font_01_sfnt_off00008d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D11 11816 bytes
SHA-256: ffb2d7e4a7a204dbb4e674d9b7f9f1c922417a79b93cda9338dc675f8cd86ae4

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