Malicious PDF — malware analysis report

Static analysis result for SHA-256 60e5688e19888270…

MALICIOUS

PDF

34.6 KB Created: 2020-03-22 02:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 58241740989623a1b329c1d5060a8a78 SHA-1: 0cfaf08ab40c4aa9c8747da7d7125230ad2ce6b4 SHA-256: 60e5688e1988827038c2e1175b0095983177f94791bd3eefbb45131469a3b4ad
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted from this sample, but the sheer volume of outbound links suggests a malicious intent to redirect users or distribute further content.

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://sfbaytherapist.com/uploads/1/3/0/7/130776567/130776567.html#jardin+de+ni%C3%B1os+anexo+a+la+normal+no.+3+de+toluca
    • http://zuzubeanpress.com/uploads/1/3/0/3/130313106/413420.pdf
    • http://backtobasicthailand.com/uploads/1/3/0/5/130550895/3753540.pdf
    • http://7m.lucky1st.com/uploads/1/3/0/8/130874372/6b204a794303.pdf
    • http://stephandanton.com/uploads/1/3/0/6/130621516/4805348.pdf
    • http://shemikamoore.com/uploads/1/3/0/6/130603989/56f77932ff127ba.pdf
    • http://apiculturehr.com/uploads/1/3/0/8/130874239/buzam.pdf
    • http://www.musiciansnutrition.com/uploads/1/3/0/4/130483566/6249000.pdf
    • http://potusshield.org/uploads/1/3/1/0/131070559/pufumajelurabive.pdf
    • http://www.stefanieworth.com/uploads/1/3/0/3/130379429/593689b3dcc061a.pdf
    • http://alohastudionh.com/uploads/1/3/0/6/130604067/wemadadazitada.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_off00005abe.bin
409216f8dfa2712d0652c19ec46d2c0fcfff230a73ffa2fbc9cfe38a2bc30ab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABE 9072 bytes

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