Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8786d01962e9b1…

MALICIOUS

PDF

85.1 KB Created: 2021-01-13 17:16:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 793ef9a186eddda7ef006d9a89e9cc2f SHA-1: 7147c58b64798c4d6cb0ac8b0cded9772d9936b0 SHA-256: bb8786d01962e9b1fdd277800c01c52090b4620727e2e5c07739b49f5d0bd5f5
234 Risk Score

Malware Insights

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

The PDF contains a lure to enable macros or editing, a common tactic for malware delivery. It also features a large number of embedded links, many pointing to redirector infrastructure like 'gettraff.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://gettraff.ru/123?utm_term=s%25C3%25ADmbolo+del+sistema+%2528administrador%2529 In PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/5832700243.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382643/normal_5fd0577641108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_5fbcbfa88d5cc.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/2258024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473902/normal_5fbffabdcd91f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_5fb365ca98f5a.pdfIn PDF document text
    • https://site-1168130.mozfiles.com/files/1168130/nilafezejev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379048/normal_5ff8b4e5cecf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473954/normal_5feff5a3c35df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_5fdbe0ce1b4e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418175/normal_5fa2c8916af28.pdfIn PDF document text
    • https://site-1171149.mozfiles.com/files/1171149/suzafevebilejo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472198/normal_5fe1902fb2def.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379968/normal_5fcdeff7ef244.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/lavoxubexivalezog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_5fbcd6116357a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 5212 bytes
SHA-256: a828afedd0bfe944fcff4e9e1b1310990f4dfead042174724afa67973da00034
font_01_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 12220 bytes
SHA-256: 3e3443e6b97f25f3aca0aaf88e327d60aa74289ffb44f731e617339facd2fec4
font_02_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 16116 bytes
SHA-256: 2ec7b87bc56cc33d32d243ecb23d136f13b6601874843951a4ee16d7972f48d9
font_03_sfnt_off00013710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13710 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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