Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5d7fd6c9444a2c…

MALICIOUS

PDF

72.9 KB Created: 2021-02-24 01:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a5763c70bb73ced956d7f99a4fce7642 SHA-1: acb9a9125087d50c220546a4bb19b27198c4f7fd SHA-256: ff5d7fd6c9444a2c9f434a73fd74021bb927f34239cb57f5ddce7704a9014c3a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to a network of malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/aws?utm_term=why+is+nonviolent+civil+disobedience+needed PDF link annotation
    • http://hargotel.xyz/37586452096hlkq7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_5fe279e92831f.pdfIn PDF document text
    • https://pobejatu.weebly.com/uploads/1/3/2/7/132741278/6989677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_6018160fecae7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454052/normal_60078d3beba3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470523/normal_5fdd5ae3cffd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5fcb1b9630110.pdfIn PDF document text
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/c36ecbdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412415/normal_5ff0f7d1d5544.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426557/normal_5fcf6b960883c.pdfIn PDF document text
    • https://bivupexas.weebly.com/uploads/1/3/1/4/131453521/jenodokovuvotosu.pdfIn PDF document text
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/xuzasebe-tumezakijib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_601096ad8057b.pdfIn PDF document text
    • https://vinunawamezod.weebly.com/uploads/1/3/1/3/131380031/pugijajimor.pdfIn PDF document text
    • http://cashthe.ru/bluestacks_4_new_versionphq74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_5feb77de9d6fb.pdfIn PDF document text
    • http://ru-dev.xyz/teacher_appreciation_week_2019_chipotleoa5os.pdfIn PDF document text
    • http://cpskras.website/is_there_a_directv_remote_appbv6s7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499283/normal_5fdd5dba74489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_601702aa582fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 5036 bytes
SHA-256: 0342b590793b8a0c815afaed7669f316f503751d15cad0cd25b6f6714ad24069
font_01_sfnt_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 10452 bytes
SHA-256: d7ff14cb8d0522ef141e3d341c12563ce0529d10b10c4883f73451db043482f2

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