Malicious PDF — malware analysis report

Static analysis result for SHA-256 251c011d88685665…

MALICIOUS

PDF

72.1 KB Created: 2020-12-14 09:06:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 121d193a82f52288980b78a1044f6c73 SHA-1: 150d7fae2fed74474f53a13a76c7129aee5490b6 SHA-256: 251c011d886856659cd69795d94d61cb5eadec6693f911c75db680800aa7cbe9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://traffset.ru/strik?utm_term=the+walking+dead+no+man%2527s+land+generator+no+survey PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390366/normal_5f9c91efbf499.pdfIn PDF document text
    • https://jelafabonopavu.weebly.com/uploads/1/3/4/4/134443296/326906998bf1c.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/7969618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481422/normal_5fcf2aa9135dc.pdfIn PDF document text
    • https://dodawuwaxa.weebly.com/uploads/1/3/4/3/134305805/ludezeboronofebodal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_5f989a5bd117d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_5fa0dcfbcc263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f97ac43f2fa7.pdfIn PDF document text
    • https://weniwekozeg.weebly.com/uploads/1/3/4/0/134012595/savuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f9cd0f98f2c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc529e012facd59cec8ad00/t/5fcc59a11e1a4d7de120a939/1607227810524/lock_screen_cute_wallpaper_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d53645-7088-4def-bed0-7fc241ad6348/zully_rodriguez_wikipedia_diccionari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5fc7b7b-39f5-430d-98c1-4dd03f93c179/18822892654.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57fd5affbf90a6609a074/t/5fd684a9de5b1220c0301b0f/1607894185953/bitumen_roof_sheets_installation.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_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 5540 bytes
SHA-256: 47bcfbd83a3a9c943b7ac83fd35a093f00fc3145aac30394d8813b5d263b525e
font_01_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 10920 bytes
SHA-256: c29e1ace5f5ac60897cf390f8dcd8efc017c587e77877988c45416005d4dea64

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