Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c47871bf98a8162…

MALICIOUS

PDF

40.5 KB Created: 2020-03-30 12:39:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7f6ed33686722eaaf4bd49dea7bb868 SHA-1: 2b5ce884e731ec4ac1f7d9c2346a35786d2b1a54 SHA-256: 8c47871bf98a81627029e8e61210178b75400066e1a96eddacc81258617392ac
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many pointing to other PDF files hosted on various domains. This pattern is indicative of a link farm, potentially used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the link farm. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external URLs is the primary indicator of malicious intent.

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 http://allamericandogexpo.com/uploads/1/3/0/6/130639355/130639355.html#azitromicina+para+tratar+clamidia
    • http://bottlerocketz.com/uploads/1/3/0/7/130740537/3d95f.pdf
    • http://vivalatinotv.com/uploads/1/3/0/5/130589036/749db.pdf
    • http://stjoehof.com/uploads/1/3/0/5/130590224/vesipavugenona_tedimofapofod_foxir_luwofo.pdf
    • http://simplyaccessorize.club/uploads/1/3/0/8/130814172/7057306.pdf
    • http://highlandfarmmarket.org/uploads/1/3/0/7/130739535/3486140.pdf
    • http://soultherapywithyola.com/uploads/1/3/0/8/130814298/bovupuzurimigunosu.pdf
    • http://go-draw.com/uploads/1/3/0/6/130621096/sebozidalubat.pdf
    • http://thebestaddress.org/uploads/1/3/0/5/130539992/1438988.pdf
    • http://ourfinancialplans.com/uploads/1/3/0/8/130873915/85c115596b479.pdf
    • http://yogaindradevi.com/uploads/1/3/0/4/130483900/1723157.pdf
    • http://waybrightresidential.com/uploads/1/3/0/8/130814469/zugagelumuser.pdf
    • http://lakepropertiesrealestate.com/uploads/1/3/0/9/130969262/9065773.pdf
    • http://dannykatzenglish.com/uploads/1/3/0/8/130874085/9520297.pdf
    • http://nachklang.de/uploads/1/3/0/6/130604689/bamik.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072b8.bin
357a935773f25ce9ec5e55c3f17ebde410d4a6f8d7ac2d252f7bf0fdbdbb4a1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B8 10012 bytes

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