Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bd5abb8f535e94…

MALICIOUS

PDF

39.6 KB Created: 2020-04-01 16:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f396d77e66819cd0f8b46b8d3ce0a5d0 SHA-1: 89b685479c5217c4db7af03631e1e87cd2cef6e0 SHA-256: 15bd5abb8f535e945af83ac3862bb2e0745841464f1c117a8c485cdc703c1d0b
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, suggesting a link farm or redirection mechanism to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of external links points towards a phishing or malware distribution attempt. While no scripts were explicitly extracted, the structure and heuristics suggest the PDF is designed to drive traffic to these external resources.

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://bitofclasspetfashion.net/uploads/1/3/0/8/130814441/130814441.html#excel+bloquear+rango+de+celdas
    • http://unmannedoilfield.ca/uploads/1/3/0/5/130551247/gidisuso.pdf
    • http://2ag-remedy.com/uploads/1/3/0/7/130775490/50fd7be.pdf
    • http://myruffledskirts.com/uploads/1/3/0/7/130738918/lawana.pdf
    • http://bradysdouxbabies.com/uploads/1/3/0/3/130323127/b5627796288ac2b.pdf
    • http://filtrationstationusa.com/uploads/1/3/0/7/130738974/e80ef4aa6e8.pdf
    • http://theparispapers.net/uploads/1/3/0/4/130483418/d7abdd81117451d.pdf
    • http://celebrate-it.net/uploads/1/3/1/3/131380456/kogomixoji.pdf
    • http://everythingbusiness.shop/uploads/1/3/0/7/130775220/2785037.pdf
    • http://bremerschoolofirishdance.com/uploads/1/3/0/7/130740450/16e8f.pdf
    • http://kjohn.net/uploads/1/3/0/5/130590339/taloju.pdf
    • http://sklamm.com/uploads/1/3/0/6/130605094/4482217.pdf
    • http://trestlestop.com/uploads/1/3/0/8/130873894/1880076.pdf
    • http://innovativeremodeling.net/uploads/1/3/1/4/131437275/raler-ginow-kasitazi-wuwodo.pdf
    • http://chickything.com/uploads/1/3/1/3/131398215/kaxat.pdf
    • http://barbellvillains.com/uploads/1/3/0/7/130739711/kovufawajag.pdf
    • http://burgdorffamily.com/uploads/1/3/0/6/130604176/3634d976f81.pdf
    • http://sportsgrinding.com/uploads/1/3/0/5/130539287/fukipezatuletu-xanurojokaz-bomodagipofurow-tawepa.pdf
    • http://soyouthinkyoucandovoiceover.com/uploads/1/3/0/5/130539340/sinugegoge.pdf
    • http://vecinoservice.com/uploads/1/3/0/7/130739105/gasuriw_jogogasil_jidew.pdf
    • http://meaningfullifework.com/uploads/1/3/0/7/130739923/mamaxepawezow.pdf
    • http://ekaterinahart.com/uploads/1/3/0/7/130775784/2457647.pdf
    • http://harellbusinesssolutions.com/uploads/1/3/0/2/130288563/769686.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_off00007133.bin
e5b59a7153081028c22bf6cc5594cce73a378edf38a400d1f10b0eabd2c3606c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7133 8636 bytes

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