Malicious PDF — malware analysis report

Static analysis result for SHA-256 625b3fb1f422ed78…

MALICIOUS

PDF

67.3 KB Created: 2021-04-03 14:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c3bf9c9dace454c10a4f18264f0e1a1b SHA-1: f6bc23df2b1601561a5de18c2a89334dbe575504 SHA-256: 625b3fb1f422ed78f670b7121885399a9c84899f390e235d735f44ac92723ec0
234 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating a malicious redirector link to 'https://dafemum.ru/award?keyword=understanding+business+12th+pdf'. Additionally, ClamAV detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', and a machine learning classifier flagged it with high confidence. The document body, though malformed, suggests a lure related to 'understanding business'. The presence of numerous external PDF links further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://dafemum.ru/award?keyword=understanding+business+12th+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_5fd78b3aa3a58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_604b928b6aba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_602b881382b11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_600b0334da543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_5fd33196e7261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_604022aa9a9ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5fe60c74a651d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497078/normal_5fe31d4d2bb7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_60298493d32a0.pdfIn PDF document text
    • http://fajavipax.22web.org/64012644588.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428043/normal_5ff3a75528129.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5fe19e909ac4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_5fda2a255f125.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_8e44e33a571a4f78ae9d4f8410cd9660.pdf?index=trueIn PDF document text
    • https://0978d23c-7b87-408a-b4ab-ff16da0dae51.filesusr.com/ugd/369d68_e8b9a99747d6428fad859231ef1d2c3f.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_bff8527023644e349b54eaa88ba09bd3.pdf?index=trueIn PDF document text
    • http://sobenikirija.rf.gd/nodovudutoxovep.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_off0000c7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B5 5584 bytes
SHA-256: f4d8d93e2be160255aade9ae96948528e1d65f1e6b0a67c5faa8f00512592ffa
font_01_sfnt_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 10644 bytes
SHA-256: d3f20cd0ed0be5a67caa74b343bd32c0f58c49881a3be95e8b4cb14738243ea3

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