Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7291306e08ddc0…

MALICIOUS

PDF

43.6 KB Created: 2020-11-08 22:26:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cb2ef2ab08df64f1975e060ba9856bb4 SHA-1: 54489c6f1d8b036ae810b95c3cc916eb5fa7c0c8 SHA-256: 6c7291306e08ddc04374ede522d25c8365957ec39f6cacd2af427a86d962f78b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or a mechanism for distributing malicious content. The primary URL, 'https://trafffi.ru/123?keyword=sea-floor+spreading+worksheet', is presented as a worksheet, a common lure for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly indicate malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffi.ru/123?keyword=sea-floor+spreading+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379380/normal_5fa743be3c08f.pdfIn PDF document text
    • https://wofixoxabovu.weebly.com/uploads/1/3/4/5/134524794/463606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f86f93d6f527.pdfIn PDF document text
    • https://wajevuwefabebos.weebly.com/uploads/1/3/4/6/134681626/8514122.pdfIn PDF document text
    • https://jutebipofan.weebly.com/uploads/1/3/4/3/134334370/kitawonosuzarow_bepadasimevuja_sebuledidad_nolinesazukem.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/domegagowevag/96484823585.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/make_file_executable_chmod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0d380a-71ce-4b11-9ce0-a785272d83b7/dusuzajew.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/93182904993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2912a9a-d4b8-4445-9aed-982267e0e6bd/dixalexeveru.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/maxizazokoduregale.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_off000056fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56FE 5596 bytes
SHA-256: 1e72e16b482a979a2ea2d8c6858777e90579f45cf5557bfea09a7ee3ef25c3a0
font_01_sfnt_off00006a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1A 10060 bytes
SHA-256: d7b262294348df58acb2b285e0237a1909a93a28f67aa3133fc70dcfc587051b
font_02_sfnt_off00008cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBB 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf

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